{"id":3454,"date":"2026-07-19T03:10:44","date_gmt":"2026-07-19T03:10:44","guid":{"rendered":"https:\/\/vbaseup.com\/kien-thuc\/?p=3454"},"modified":"2026-07-19T03:12:44","modified_gmt":"2026-07-19T03:12:44","slug":"duplicate-content","status":"publish","type":"post","link":"https:\/\/vbaseup.com\/kien-thuc\/duplicate-content\/","title":{"rendered":"Duplicate content trong SEO: Nguy\u00ean nh\u00e2n v\u00e0 c\u00e1ch x\u1eed l\u00fd"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/vbaseup.com\/kien-thuc\/wp-content\/uploads\/2026\/07\/duplicate-content-seo.webp\" alt=\"duplicate content SEO n\u1ed9i dung tr\u00f9ng l\u1eb7p nhi\u1ec1u URL \u1ea3nh h\u01b0\u1edfng th\u1ee9 h\u1ea1ng t\u00ecm ki\u1ebfm\" \/><\/p>\n<p>Duplicate content SEO xu\u1ea5t hi\u1ec7n khi c\u00f9ng m\u1ed9t n\u1ed9i dung t\u1ed3n t\u1ea1i tr\u00ean nhi\u1ec1u URL, d\u00f9 c\u00e1c URL \u0111\u00f3 thu\u1ed9c c\u00f9ng m\u1ed9t website hay n\u1eb1m tr\u00ean nh\u1eefng domain kh\u00e1c nhau. V\u1ea5n \u0111\u1ec1 kh\u00f4ng n\u1eb1m \u1edf vi\u1ec7c m\u1ed9t \u0111o\u1ea1n v\u0103n \u0111\u01b0\u1ee3c l\u1eb7p l\u1ea1i \u0111\u01a1n thu\u1ea7n. \u0110i\u1ec1u \u0111\u00e1ng lo l\u00e0 search engine ph\u1ea3i quy\u1ebft \u0111\u1ecbnh URL n\u00e0o \u0111\u1ea1i di\u1ec7n cho n\u1ed9i dung, t\u00edn hi\u1ec7u li\u00ean k\u1ebft n\u00ean \u0111\u01b0\u1ee3c ghi nh\u1eadn \u1edf \u0111\u00e2u v\u00e0 nh\u1eefng trang n\u00e0o \u0111\u00e1ng \u0111\u01b0\u1ee3c thu th\u1eadp d\u1eef li\u1ec7u.<\/p>\n<p><strong>Duplicate content th\u01b0\u1eddng kh\u00f4ng d\u1eabn \u0111\u1ebfn h\u00ecnh ph\u1ea1t t\u1ef1 \u0111\u1ed9ng t\u1eeb Google.<\/strong> Tuy nhi\u00ean, n\u00f3 c\u00f3 th\u1ec3 l\u00e0m ph\u00e2n t\u00e1n crawl budget, link equity v\u00e0 t\u00edn hi\u1ec7u x\u1ebfp h\u1ea1ng. Khi website c\u00e0ng l\u1edbn, nh\u1eefng t\u1ed5n th\u1ea5t nh\u1ecf n\u00e0y c\u00e0ng t\u00edch t\u1ee5 th\u00e0nh v\u1ea5n \u0111\u1ec1 \u0111\u00e1ng k\u1ec3.<\/p>\n<p>B\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y ph\u00e2n t\u00edch duplicate content l\u00e0 g\u00ec, \u1ea3nh h\u01b0\u1edfng nh\u01b0 th\u1ebf n\u00e0o \u0111\u1ebfn SEO v\u00e0 AI Search, nguy\u00ean nh\u00e2n ph\u1ed5 bi\u1ebfn, c\u00e1ch ph\u00e1t hi\u1ec7n c\u0169ng nh\u01b0 ph\u01b0\u01a1ng ph\u00e1p kh\u1eafc ph\u1ee5c ph\u00f9 h\u1ee3p cho t\u1eebng tr\u01b0\u1eddng h\u1ee3p.<\/p>\n<h2>Duplicate Content l\u00e0 g\u00ec?<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/vbaseup.com\/kien-thuc\/wp-content\/uploads\/2026\/07\/duplicate-content-dinh-nghia.webp\" alt=\"duplicate content \u0111\u1ecbnh ngh\u0129a n\u1ed9i dung tr\u00f9ng l\u1eb7p internal external URL kh\u00e1c nhau\" \/><\/p>\n<blockquote><p>Duplicate content l\u00e0 n\u1ed9i dung gi\u1ed1ng h\u1ec7t ho\u1eb7c g\u1ea7n gi\u1ed1ng \u0111\u00e1ng k\u1ec3 xu\u1ea5t hi\u1ec7n tr\u00ean nhi\u1ec1u URL kh\u00e1c nhau.<\/p><\/blockquote>\n<p>Search engine kh\u00f4ng ch\u1ec9 nh\u00ecn v\u00e0o c\u00e2u ch\u1eef. H\u1ec7 th\u1ed1ng c\u00f2n so s\u00e1nh ph\u1ea7n n\u1ed9i dung ch\u00ednh, c\u1ea5u tr\u00fac trang v\u00e0 m\u1ee9c \u0111\u1ed9 t\u01b0\u01a1ng \u0111\u1ed3ng t\u1ed5ng th\u1ec3. V\u00ec v\u1eady, hai trang kh\u00f4ng c\u1ea7n gi\u1ed1ng nhau t\u1eebng k\u00fd t\u1ef1 v\u1eabn c\u00f3 th\u1ec3 b\u1ecb xem l\u00e0 g\u1ea7n tr\u00f9ng l\u1eb7p.<\/p>\n<p>Duplicate content c\u00f3 hai d\u1ea1ng ch\u00ednh:<\/p>\n<ul>\n<li><strong>Internal duplicate content:<\/strong> nhi\u1ec1u URL tr\u00ean c\u00f9ng m\u1ed9t domain ch\u1ee9a n\u1ed9i dung gi\u1ed1ng ho\u1eb7c g\u1ea7n gi\u1ed1ng nhau. V\u00ed d\u1ee5, c\u00e1c tham s\u1ed1 l\u1ecdc t\u1ea1o ra nhi\u1ec1u phi\u00ean b\u1ea3n c\u1ee7a c\u00f9ng m\u1ed9t trang s\u1ea3n ph\u1ea9m.<\/li>\n<li><strong>External duplicate content:<\/strong> c\u00f9ng m\u1ed9t n\u1ed9i dung xu\u1ea5t hi\u1ec7n tr\u00ean nhi\u1ec1u domain. Tr\u01b0\u1eddng h\u1ee3p n\u00e0y th\u01b0\u1eddng x\u1ea3y ra khi b\u00e0i vi\u1ebft b\u1ecb sao ch\u00e9p, \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i l\u1ea1i nh\u01b0ng kh\u00f4ng c\u00f3 canonical attribution ho\u1eb7c nhi\u1ec1u nh\u00e0 b\u00e1n l\u1ebb c\u00f9ng d\u00f9ng m\u00f4 t\u1ea3 t\u1eeb nh\u00e0 s\u1ea3n xu\u1ea5t.<\/li>\n<\/ul>\n<p>Duplicate content c\u0169ng c\u1ea7n \u0111\u01b0\u1ee3c ph\u00e2n bi\u1ec7t v\u1edbi thin content v\u00e0 similar content. Thin content l\u00e0 trang thi\u1ebfu gi\u00e1 tr\u1ecb th\u1ef1c ch\u1ea5t, d\u00f9 n\u1ed9i dung c\u00f3 tr\u00f9ng l\u1eb7p hay kh\u00f4ng. Similar content l\u00e0 nh\u1eefng trang c\u00f3 m\u1ed9t s\u1ed1 \u0111i\u1ec3m gi\u1ed1ng nhau nh\u01b0ng ch\u01b0a \u0111\u1ea1t m\u1ee9c g\u1ea7n tr\u00f9ng l\u1eb7p. Trong c\u00f4ng c\u1ee5 crawl, exact duplicate th\u01b0\u1eddng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng n\u1ed9i dung gi\u1ed1ng h\u1ec7t, c\u00f2n near duplicate c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c nh\u1eadn di\u1ec7n \u1edf ng\u01b0\u1ee1ng t\u01b0\u01a1ng \u0111\u1ed3ng kho\u1ea3ng 90%.<\/p>\n<h2>T\u1ea1i sao Duplicate Content \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn SEO?<\/h2>\n<p>Duplicate content kh\u00f4ng nh\u1ea5t thi\u1ebft ph\u00e1 h\u1ee7y th\u1ee9 h\u1ea1ng ngay l\u1eadp t\u1ee9c. T\u00e1c \u0111\u1ed9ng c\u1ee7a n\u00f3 di\u1ec5n ra \u00e2m th\u1ea7m h\u01a1n: search engine ph\u1ea3i d\u00e0nh t\u00e0i nguy\u00ean cho c\u00e1c URL kh\u00f4ng t\u1ea1o th\u00eam gi\u00e1 tr\u1ecb, trong khi t\u00edn hi\u1ec7u x\u1ebfp h\u1ea1ng b\u1ecb chia nh\u1ecf gi\u1eefa nhi\u1ec1u phi\u00ean b\u1ea3n c\u1ee7a c\u00f9ng m\u1ed9t n\u1ed9i dung.<\/p>\n<h3>L\u00e3ng ph\u00ed crawl budget v\u00e0 l\u00e0m ch\u1eadm ch\u1ec9 m\u1ee5c<\/h3>\n<p>Crawl budget l\u00e0 s\u1ed1 URL m\u00e0 Googlebot c\u00f3 th\u1ec3 v\u00e0 mu\u1ed1n thu th\u1eadp d\u1eef li\u1ec7u tr\u00ean m\u1ed9t website trong m\u1ed9t kho\u1ea3ng th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh. M\u1ed7i l\u1ea7n Googlebot truy c\u1eadp m\u1ed9t URL tr\u00f9ng l\u1eb7p, m\u1ed9t ph\u1ea7n t\u00e0i nguy\u00ean crawl \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0ng kh\u00f4ng gi\u00fap search engine kh\u00e1m ph\u00e1 th\u00eam n\u1ed9i dung c\u00f3 gi\u00e1 tr\u1ecb.<\/p>\n<p>V\u1ea5n \u0111\u1ec1 n\u00e0y \u0111\u1eb7c bi\u1ec7t r\u00f5 tr\u00ean website l\u1edbn. M\u1ed9t trang th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed c\u00f3 th\u1ec3 t\u1ea1o h\u00e0ng ngh\u00ecn URL t\u1eeb b\u1ed9 l\u1ecdc m\u00e0u s\u1eafc, k\u00edch th\u01b0\u1edbc, gi\u00e1, th\u1ee9 t\u1ef1 s\u1eafp x\u1ebfp ho\u1eb7c m\u00e3 theo d\u00f5i. Googlebot ph\u1ea3i \u0111i qua c\u00e1c URL \u0111\u00f3 tr\u01b0\u1edbc khi t\u00ecm \u0111\u1ebfn s\u1ea3n ph\u1ea9m m\u1edbi ho\u1eb7c n\u1ed9i dung quan tr\u1ecdng v\u1eeba \u0111\u01b0\u1ee3c xu\u1ea5t b\u1ea3n.<\/p>\n<p>Chu\u1ed7i t\u00e1c \u0111\u1ed9ng kh\u00e1 \u0111\u01a1n gi\u1ea3n: tham s\u1ed1 t\u1ea1o ra nhi\u1ec1u b\u1ea3n sao, crawl budget b\u1ecb ph\u00e2n t\u00e1n, trang quan tr\u1ecdng \u0111\u01b0\u1ee3c kh\u00e1m ph\u00e1 ch\u1eadm h\u01a1n v\u00e0 qu\u00e1 tr\u00ecnh l\u1eadp ch\u1ec9 m\u1ee5c k\u00e9o d\u00e0i. Khi s\u1ed1 URL \u0111\u01b0\u1ee3c index v\u01b0\u1ee3t xa s\u1ed1 trang th\u1ef1c s\u1ef1 c\u1ea7n xu\u1ea5t hi\u1ec7n tr\u00ean Google, website c\u00f3 th\u1ec3 g\u1eb7p t\u00ecnh tr\u1ea1ng <a href=\"https:\/\/vbaseup.com\/kien-thuc\/index-bloat\/\">index bloat<\/a>.<\/p>\n<h3>Hi\u1ec3n th\u1ecb sai URL tr\u00ean k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm<\/h3>\n<p>Khi ph\u00e1t hi\u1ec7n nhi\u1ec1u URL c\u00f3 c\u00f9ng n\u1ed9i dung, Google th\u01b0\u1eddng nh\u00f3m ch\u00fang th\u00e0nh m\u1ed9t c\u1ee5m v\u00e0 ch\u1ecdn m\u1ed9t URL \u0111\u1ea1i di\u1ec7n. URL n\u00e0y \u0111\u01b0\u1ee3c xem l\u00e0 canonical theo thu\u1eadt to\u00e1n c\u1ee7a Google, nh\u01b0ng kh\u00f4ng nh\u1ea5t thi\u1ebft tr\u00f9ng v\u1edbi URL m\u00e0 ch\u1ee7 website mu\u1ed1n hi\u1ec3n th\u1ecb.<\/p>\n<p>Google Search Console c\u00f3 th\u1ec3 ghi nh\u1eadn c\u00e1c tr\u1ea1ng th\u00e1i nh\u01b0:<\/p>\n<ul>\n<li>\u201cDuplicate without user-selected canonical\u201d.<\/li>\n<li>\u201cDuplicate, Google chose different canonical than user\u201d.<\/li>\n<li>\u201cDuplicate, submitted URL not selected as canonical\u201d.<\/li>\n<\/ul>\n<p>N\u1ebfu Google ch\u1ecdn sai URL, v\u1ea5n \u0111\u1ec1 kh\u00f4ng ch\u1ec9 n\u1eb1m \u1edf h\u00ecnh th\u1ee9c \u0111\u01b0\u1eddng d\u1eabn. M\u1ed9t trang khu v\u1ef1c c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n v\u1edbi \u0111\u01a1n v\u1ecb ti\u1ec1n t\u1ec7 kh\u00f4ng ph\u00f9 h\u1ee3p, schema sai th\u1ecb tr\u01b0\u1eddng ho\u1eb7c metadata kh\u00f4ng \u0111\u00fang \u0111\u1ed1i t\u01b0\u1ee3ng. Ng\u01b0\u1eddi d\u00f9ng nh\u00ecn th\u1ea5y m\u1ed9t phi\u00ean b\u1ea3n thi\u1ebfu nh\u1ea5t qu\u00e1n v\u1edbi th\u01b0\u01a1ng hi\u1ec7u, c\u00f2n website m\u1ea5t quy\u1ec1n ki\u1ec3m so\u00e1t trang \u0111\u1ea1i di\u1ec7n tr\u00ean SERP.<\/p>\n<h3>Pha lo\u00e3ng t\u00edn hi\u1ec7u li\u00ean k\u1ebft (link equity)<\/h3>\n<p>Backlink l\u00e0 m\u1ed9t t\u00edn hi\u1ec7u cho th\u1ea5y trang \u0111\u01b0\u1ee3c website kh\u00e1c tham chi\u1ebfu v\u00e0 \u0111\u00e1nh gi\u00e1 c\u00f3 gi\u00e1 tr\u1ecb. Nh\u01b0ng n\u1ebfu c\u00e1c backlink tr\u1ecf \u0111\u1ebfn nhi\u1ec1u phi\u00ean b\u1ea3n c\u1ee7a c\u00f9ng m\u1ed9t trang, link equity s\u1ebd b\u1ecb ph\u00e2n t\u00e1n.<\/p>\n<p>Gi\u1ea3 s\u1eed m\u1ed9t n\u1ed9i dung c\u00f3 ba URL kh\u00e1c nhau do HTTP, HTTPS v\u00e0 WWW. N\u1ebfu 10 backlink \u0111\u01b0\u1ee3c chia \u0111\u1ec1u cho ba phi\u00ean b\u1ea3n, m\u1ed7i URL ch\u1ec9 nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t ph\u1ea7n t\u00edn hi\u1ec7u thay v\u00ec URL ch\u00ednh nh\u1eadn to\u00e0n b\u1ed9 10 backlink. K\u1ebft qu\u1ea3 l\u00e0 ti\u1ec1m n\u0103ng x\u1ebfp h\u1ea1ng c\u1ee7a trang b\u1ecb suy y\u1ebfu.<\/p>\n<p>H\u1ee3p nh\u1ea5t c\u00e1c trang duplicate gi\u00fap \u0111\u01b0a t\u00edn hi\u1ec7u li\u00ean k\u1ebft tr\u1edf l\u1ea1i m\u1ed9t URL canonical duy nh\u1ea5t. Hai c\u00f4ng c\u1ee5 ph\u1ed5 bi\u1ebfn \u0111\u1ec3 th\u1ef1c hi\u1ec7n vi\u1ec7c n\u00e0y l\u00e0 th\u1ebb canonical v\u00e0 chuy\u1ec3n h\u01b0\u1edbng 301. Canonical ph\u00f9 h\u1ee3p khi URL ph\u1ee5 v\u1eabn c\u1ea7n t\u1ed3n t\u1ea1i, c\u00f2n 301 ph\u00f9 h\u1ee3p khi phi\u00ean b\u1ea3n ph\u1ee5 kh\u00f4ng c\u00f2n l\u00fd do \u0111\u1ec3 \u0111\u01b0\u1ee3c truy c\u1eadp \u0111\u1ed9c l\u1eadp.<\/p>\n<h2>Nguy\u00ean nh\u00e2n g\u00e2y ra Duplicate Content<\/h2>\n<p>Ph\u1ea7n l\u1edbn duplicate content kh\u00f4ng b\u1eaft \u0111\u1ea7u t\u1eeb h\u00e0nh vi sao ch\u00e9p c\u00f3 ch\u1ee7 \u00fd. N\u00f3 th\u01b0\u1eddng l\u00e0 s\u1ea3n ph\u1ea9m ph\u1ee5 c\u1ee7a CMS, c\u1ea5u tr\u00fac URL, h\u1ec7 th\u1ed1ng l\u1ecdc ho\u1eb7c qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i website ch\u01b0a \u0111\u01b0\u1ee3c x\u1eed l\u00fd ho\u00e0n ch\u1ec9nh.<\/p>\n<h3>Bi\u1ebfn th\u1ec3 URL v\u00e0 tham s\u1ed1 k\u1ef9 thu\u1eadt<\/h3>\n<p>M\u1ed9t trang c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i d\u01b0\u1edbi h\u00e0ng ch\u1ee5c URL khi h\u1ec7 th\u1ed1ng t\u1ef1 \u0111\u1ed9ng g\u1eafn th\u00eam tham s\u1ed1. Nh\u1eefng bi\u1ebfn th\u1ec3 ph\u1ed5 bi\u1ebfn g\u1ed3m:<\/p>\n<ul>\n<li>B\u1ed9 l\u1ecdc nh\u01b0 <code>?color=red<\/code>.<\/li>\n<li>Tham s\u1ed1 s\u1eafp x\u1ebfp s\u1ea3n ph\u1ea9m.<\/li>\n<li>Session ID nh\u01b0 <code>?sessionid=123<\/code>.<\/li>\n<li>M\u00e3 theo d\u00f5i nh\u01b0 <code>?utm_source=email<\/code>.<\/li>\n<li>URL c\u00f3 ho\u1eb7c kh\u00f4ng c\u00f3 d\u1ea5u g\u1ea1ch ch\u00e9o cu\u1ed1i: <code>\/page\/<\/code> v\u00e0 <code>\/page<\/code>.<\/li>\n<li>URL kh\u00e1c nhau v\u1ec1 ch\u1eef hoa v\u00e0 ch\u1eef th\u01b0\u1eddng.<\/li>\n<li>Bi\u1ebfn th\u1ec3 s\u1ea3n ph\u1ea9m theo m\u00e0u s\u1eafc, k\u00edch th\u01b0\u1edbc ho\u1eb7c SKU.<\/li>\n<\/ul>\n<p>V\u1edbi ng\u01b0\u1eddi d\u00f9ng, c\u00e1c URL n\u00e0y c\u00f3 th\u1ec3 c\u00f9ng d\u1eabn \u0111\u1ebfn m\u1ed9t s\u1ea3n ph\u1ea9m. V\u1edbi search engine, m\u1ed7i \u0111\u01b0\u1eddng d\u1eabn l\u1ea1i l\u00e0 m\u1ed9t \u0111\u1ecba ch\u1ec9 c\u00f3 kh\u1ea3 n\u0103ng \u0111\u01b0\u1ee3c crawl v\u00e0 index ri\u00eang.<\/p>\n<p>Quy m\u00f4 v\u1ea5n \u0111\u1ec1 t\u0103ng r\u1ea5t nhanh. M\u1ed9t website c\u00f3 500 s\u1ea3n ph\u1ea9m v\u00e0 10 tham s\u1ed1 l\u1ecdc \u0111\u00e3 c\u00f3 th\u1ec3 t\u1ea1o h\u01a1n 5.000 URL ti\u1ec1m n\u0103ng. N\u1ebfu c\u00e1c URL \u0111\u1ec1u ch\u1ee9a ph\u1ea7n n\u1ed9i dung ch\u00ednh gi\u1ed1ng nhau, search engine ph\u1ea3i x\u1eed l\u00fd m\u1ed9t h\u1ec7 th\u1ed1ng l\u1edbn h\u01a1n nhi\u1ec1u so v\u1edbi s\u1ed1 trang th\u1ef1c s\u1ef1 c\u00f3 gi\u00e1 tr\u1ecb.<\/p>\n<h3>HTTP vs HTTPS v\u00e0 WWW vs non-WWW<\/h3>\n<p>M\u1ed9t trang ch\u1ee7 c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed3ng th\u1eddi \u1edf b\u1ed1n \u0111\u1ecba ch\u1ec9:<\/p>\n<ul>\n<li><code>http:\/\/domain.com<\/code><\/li>\n<li><code>https:\/\/domain.com<\/code><\/li>\n<li><code>http:\/\/www.domain.com<\/code><\/li>\n<li><code>https:\/\/www.domain.com<\/code><\/li>\n<\/ul>\n<p>N\u1ebfu m\u00e1y ch\u1ee7 kh\u00f4ng chuy\u1ec3n h\u01b0\u1edbng c\u00e1c phi\u00ean b\u1ea3n ph\u1ee5, search engine c\u00f3 th\u1ec3 xem \u0111\u00e2y l\u00e0 b\u1ed1n URL \u0111\u1ed9c l\u1eadp. N\u1ed9i dung gi\u1ed1ng nhau, nh\u01b0ng backlink, internal link v\u00e0 t\u00edn hi\u1ec7u x\u1ebfp h\u1ea1ng l\u1ea1i b\u1ecb chia cho nhi\u1ec1u \u0111\u1ecba ch\u1ec9.<\/p>\n<p>\u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng l\u1ed7i duplicate content ph\u1ed5 bi\u1ebfn nh\u1ea5t, \u0111\u1ed3ng th\u1eddi c\u0169ng d\u1ec5 kh\u1eafc ph\u1ee5c nh\u1ea5t. Website c\u1ea7n ch\u1ecdn m\u1ed9t phi\u00ean b\u1ea3n chu\u1ea9n v\u00e0 d\u00f9ng <a href=\"https:\/\/vbaseup.com\/kien-thuc\/redirect\/\">301 redirect<\/a> \u0111\u1ec3 chuy\u1ec3n t\u1ea5t c\u1ea3 bi\u1ebfn th\u1ec3 c\u00f2n l\u1ea1i v\u1ec1 \u0111\u00f3. L\u1ed7i th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n tr\u00ean website c\u0169 ho\u1eb7c sau khi migration t\u1eeb HTTP sang HTTPS nh\u01b0ng ch\u01b0a redirect to\u00e0n b\u1ed9 URL c\u0169.<\/p>\n<h3>Trang danh m\u1ee5c, tag, archive v\u00e0 n\u1ed9i dung CMS<\/h3>\n<p>CMS nh\u01b0 WordPress c\u00f3 th\u1ec3 t\u1ef1 t\u1ea1o trang category, tag, archive v\u00e0 author cho c\u00f9ng m\u1ed9t nh\u00f3m b\u00e0i vi\u1ebft. N\u1ebfu nh\u1eefng trang n\u00e0y hi\u1ec3n th\u1ecb to\u00e0n b\u1ed9 n\u1ed9i dung ho\u1eb7c excerpt qu\u00e1 d\u00e0i, ch\u00fang d\u1ec5 tr\u1edf th\u00e0nh b\u1ea3n g\u1ea7n tr\u00f9ng l\u1eb7p v\u1edbi b\u00e0i vi\u1ebft g\u1ed1c.<\/p>\n<p>M\u1ed9t b\u00e0i vi\u1ebft khi \u0111\u00f3 kh\u00f4ng ch\u1ec9 c\u00f3 URL ri\u00eang. N\u1ed9i dung c\u1ee7a n\u00f3 c\u00f2n xu\u1ea5t hi\u1ec7n tr\u00ean trang danh m\u1ee5c, trang th\u1ebb, trang l\u01b0u tr\u1eef theo th\u00e1ng v\u00e0 trang t\u00e1c gi\u1ea3. Khi nhi\u1ec1u b\u00e0i c\u00f9ng \u0111\u01b0\u1ee3c x\u1eed l\u00fd theo c\u00e1ch n\u00e0y, website h\u00ecnh th\u00e0nh m\u1ed9t m\u1ea1ng l\u01b0\u1edbi URL ch\u1ee9a nh\u1eefng kh\u1ed1i n\u1ed9i dung l\u1eb7p l\u1ea1i.<\/p>\n<p>Tuy nhi\u00ean, header, footer, sidebar hay th\u00f4ng b\u00e1o ph\u00e1p l\u00fd gi\u1ed1ng nhau tr\u00ean m\u1ecdi trang th\u01b0\u1eddng kh\u00f4ng \u0111\u1ee7 \u0111\u1ec3 t\u1ea1o duplicate content. Search engine c\u00f3 th\u1ec3 ph\u00e2n bi\u1ec7t ph\u1ea7n khu\u00f4n m\u1eabu v\u1edbi n\u1ed9i dung ch\u00ednh. V\u1ea5n \u0111\u1ec1 ch\u1ec9 tr\u1edf n\u00ean \u0111\u00e1ng k\u1ec3 khi kh\u1ed1i n\u1ed9i dung ch\u00ednh c\u1ee7a c\u00e1c URL c\u0169ng gi\u1ed1ng ho\u1eb7c g\u1ea7n gi\u1ed1ng nhau.<\/p>\n<h3>Staging site v\u00e0 n\u1ed9i dung sao ch\u00e9p t\u1eeb b\u00ean ngo\u00e0i<\/h3>\n<p>Staging site l\u00e0 b\u1ea3n sao d\u00f9ng \u0111\u1ec3 th\u1eed nghi\u1ec7m tr\u01b0\u1edbc khi thay \u0111\u1ed5i website ch\u00ednh th\u1ee9c. N\u1ebfu <code>dev.domain.com<\/code> ho\u1eb7c <code>staging.domain.com<\/code> kh\u00f4ng \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 b\u1eb1ng m\u1eadt kh\u1ea9u hay ch\u1eb7n crawl ph\u00f9 h\u1ee3p, Googlebot c\u00f3 th\u1ec3 thu th\u1eadp v\u00e0 index c\u1ea3 staging l\u1eabn production.<\/p>\n<p>Khi \u0111\u00f3, to\u00e0n b\u1ed9 website b\u1ecb nh\u00e2n \u0111\u00f4i m\u00e0 \u0111\u1ed9i ng\u0169 v\u1eadn h\u00e0nh kh\u00f4ng nh\u1eadn ra. B\u1ea3n staging th\u1eadm ch\u00ed c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c search engine ch\u1ecdn l\u00e0m canonical n\u1ebfu nh\u1eadn \u0111\u01b0\u1ee3c t\u00edn hi\u1ec7u m\u1ea1nh h\u01a1n \u1edf m\u1ed9t s\u1ed1 th\u1eddi \u0111i\u1ec3m.<\/p>\n<p>Ngu\u1ed3n external duplicate kh\u00e1c th\u01b0\u1eddng g\u1eb7p trong th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed l\u00e0 m\u00f4 t\u1ea3 t\u1eeb nh\u00e0 s\u1ea3n xu\u1ea5t. Khi h\u00e0ng tr\u0103m nh\u00e0 b\u00e1n l\u1ebb s\u1eed d\u1ee5ng nguy\u00ean v\u0103n c\u00f9ng m\u1ed9t \u0111o\u1ea1n gi\u1edbi thi\u1ec7u s\u1ea3n ph\u1ea9m, search engine ph\u1ea3i ch\u1ecdn m\u1ed9t s\u1ed1 phi\u00ean b\u1ea3n \u0111\u1ea1i di\u1ec7n. Website m\u1edbi ho\u1eb7c c\u00f3 authority th\u1ea5p c\u00f3 th\u1ec3 kh\u00f4ng \u0111\u01b0\u1ee3c ch\u1ecdn, d\u00f9 s\u1ea3n ph\u1ea9m v\u1eabn \u0111\u01b0\u1ee3c b\u00e1n h\u1ee3p l\u1ec7.<\/p>\n<h2>Duplicate Content c\u00f3 b\u1ecb Google ph\u1ea1t kh\u00f4ng?<\/h2>\n<p><strong>Duplicate content th\u00f4ng th\u01b0\u1eddng kh\u00f4ng k\u00edch ho\u1ea1t m\u1ed9t h\u00ecnh ph\u1ea1t t\u1ef1 \u0111\u1ed9ng t\u1eeb Google.<\/strong> Thay v\u00ec tr\u1eeb m\u1ed9t \u201c\u0111i\u1ec3m ph\u1ea1t\u201d, Google th\u01b0\u1eddng nh\u00f3m c\u00e1c URL tr\u00f9ng l\u1eb7p, ch\u1ecdn m\u1ed9t URL \u0111\u1ea1i di\u1ec7n v\u00e0 h\u1ea1n ch\u1ebf hi\u1ec3n th\u1ecb c\u00e1c phi\u00ean b\u1ea3n c\u00f2n l\u1ea1i trong k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm li\u00ean quan.<\/p>\n<p>V\u00ec v\u1eady, kh\u00f4ng \u0111\u01b0\u1ee3c x\u1ebfp h\u1ea1ng kh\u00f4ng \u0111\u1ed3ng ngh\u0129a v\u1edbi b\u1ecb ph\u1ea1t. M\u1ed9t URL c\u00f3 th\u1ec3 bi\u1ebfn m\u1ea5t kh\u1ecfi SERP \u0111\u01a1n gi\u1ea3n v\u00ec Google cho r\u1eb1ng m\u1ed9t URL kh\u00e1c l\u00e0 phi\u00ean b\u1ea3n ph\u00f9 h\u1ee3p h\u01a1n.<\/p>\n<p>Manual action ch\u1ec9 c\u00f3 nguy c\u01a1 xu\u1ea5t hi\u1ec7n khi vi\u1ec7c sao ch\u00e9p mang \u00fd \u0111\u1ecbnh l\u1eeba d\u1ed1i ho\u1eb7c thao t\u00fang k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm. Nh\u1eefng tr\u01b0\u1eddng h\u1ee3p \u0111\u00e1ng lo g\u1ed3m scraping quy m\u00f4 l\u1edbn, doorway pages, spun content v\u00e0 h\u1ec7 th\u1ed1ng trang theo m\u1eabu \u0111\u01b0\u1ee3c t\u1ea1o h\u00e0ng lo\u1ea1t nh\u01b0ng g\u1ea7n nh\u01b0 kh\u00f4ng cung c\u1ea5p gi\u00e1 tr\u1ecb ri\u00eang.<\/p>\n<p>H\u1eadu qu\u1ea3 th\u1ef1c t\u1ebf c\u1ee7a duplicate content k\u1ef9 thu\u1eadt v\u1eabn c\u00f3 th\u1ec3 nghi\u00eam tr\u1ecdng: Google x\u1ebfp h\u1ea1ng sai URL, backlink b\u1ecb chia nh\u1ecf v\u00e0 crawl budget b\u1ecb ti\u00eau t\u1ed1n. \u0110\u00e2y kh\u00f4ng ph\u1ea3i m\u1ed9t h\u00ecnh ph\u1ea1t tr\u1ef1c ti\u1ebfp, nh\u01b0ng k\u1ebft qu\u1ea3 cu\u1ed1i c\u00f9ng v\u1eabn l\u00e0 website s\u1eed d\u1ee5ng ngu\u1ed3n l\u1ef1c k\u00e9m hi\u1ec7u qu\u1ea3 v\u00e0 \u0111\u00e1nh m\u1ea5t ti\u1ec1m n\u0103ng hi\u1ec3n th\u1ecb.<\/p>\n<h2>C\u00e1ch ph\u00e1t hi\u1ec7n Duplicate Content tr\u00ean website<\/h2>\n<p>Kh\u00f4ng c\u00f3 m\u1ed9t c\u00f4ng c\u1ee5 duy nh\u1ea5t nh\u00ecn th\u1ea5y to\u00e0n b\u1ed9 v\u1ea5n \u0111\u1ec1. Quy tr\u00ecnh \u0111\u00e1ng tin c\u1eady c\u1ea7n k\u1ebft h\u1ee3p d\u1eef li\u1ec7u Google \u0111ang s\u1eed d\u1ee5ng, k\u1ebft qu\u1ea3 crawl to\u00e0n website v\u00e0 ki\u1ec3m tra th\u1ee7 c\u00f4ng nh\u1eefng n\u1ed9i dung c\u00f3 nguy c\u01a1 b\u1ecb sao ch\u00e9p b\u00ean ngo\u00e0i.<\/p>\n<h3>Google Search Console<\/h3>\n<p>Trong Google Search Console, h\u00e3y v\u00e0o b\u00e1o c\u00e1o <strong>Pages \u2192 Not Indexed<\/strong> v\u00e0 ki\u1ec3m tra ba nh\u00f3m tr\u1ea1ng th\u00e1i:<\/p>\n<ul>\n<li>\u201cDuplicate without user-selected canonical\u201d.<\/li>\n<li>\u201cDuplicate, Google chose different canonical than user\u201d.<\/li>\n<li>\u201cDuplicate, submitted URL not selected as canonical\u201d.<\/li>\n<\/ul>\n<p>C\u00e1c tr\u1ea1ng th\u00e1i n\u00e0y cho bi\u1ebft Google \u0111ang x\u1eed l\u00fd canonical nh\u01b0 th\u1ebf n\u00e0o. Quan tr\u1ecdng h\u01a1n, ch\u00fang gi\u00fap x\u00e1c \u0111\u1ecbnh kho\u1ea3ng c\u00e1ch gi\u1eefa URL website khai b\u00e1o v\u00e0 URL Google th\u1ef1c s\u1ef1 l\u1ef1a ch\u1ecdn.<\/p>\n<p>V\u1edbi t\u1eebng tr\u01b0\u1eddng h\u1ee3p, URL Inspection Tool cho ph\u00e9p ki\u1ec3m tra URL \u0111\u00e3 \u0111\u01b0\u1ee3c index hay ch\u01b0a, canonical do ng\u01b0\u1eddi d\u00f9ng khai b\u00e1o v\u00e0 canonical \u0111\u01b0\u1ee3c Google c\u00f4ng nh\u1eadn. N\u1ebfu hai gi\u00e1 tr\u1ecb kh\u00e1c nhau, c\u1ea7n xem l\u1ea1i internal link, sitemap, redirect v\u00e0 m\u1ee9c \u0111\u1ed9 t\u01b0\u01a1ng \u0111\u1ed3ng c\u1ee7a n\u1ed9i dung.<\/p>\n<p>M\u1ed9t ph\u00e9p ki\u1ec3m tra nhanh l\u00e0 so s\u00e1nh s\u1ed1 trang \u0111\u01b0\u1ee3c index v\u1edbi s\u1ed1 trang th\u1ef1c s\u1ef1 t\u1ed3n t\u1ea1i trong c\u1ea5u tr\u00fac n\u1ed9i dung. Kho\u1ea3ng c\u00e1ch b\u1ea5t th\u01b0\u1eddng c\u00f3 th\u1ec3 l\u00e0 d\u1ea5u hi\u1ec7u c\u1ee7a URL tham s\u1ed1, trang l\u1ecdc ho\u1eb7c c\u00e1c d\u1ea1ng <a href=\"https:\/\/vbaseup.com\/kien-thuc\/index-bloat\/\">index bloat<\/a> do duplicate content.<\/p>\n<h3>Screaming Frog SEO Spider<\/h3>\n<p>Screaming Frog SEO Spider crawl to\u00e0n b\u1ed9 URL c\u00f3 th\u1ec3 ti\u1ebfp c\u1eadn v\u00e0 ph\u00e2n lo\u1ea1i c\u00e1c trang tr\u00f9ng l\u1eb7p. Exact duplicate c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng MD5 hash gi\u1ed1ng nhau. Near duplicate \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n d\u1ef1a tr\u00ean t\u1ef7 l\u1ec7 t\u01b0\u01a1ng \u0111\u1ed3ng, v\u1edbi ng\u01b0\u1ee1ng m\u1eb7c \u0111\u1ecbnh th\u01b0\u1eddng \u1edf m\u1ee9c t\u1eeb 90%.<\/p>\n<p>Ng\u01b0\u1ee1ng n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh r\u1ed3i crawl l\u1ea1i. Gi\u1ea3m ng\u01b0\u1ee1ng gi\u00fap t\u00ecm th\u00eam nh\u1eefng trang g\u1ea7n gi\u1ed1ng, nh\u01b0ng c\u0169ng t\u1ea1o nhi\u1ec1u k\u1ebft qu\u1ea3 c\u1ea7n \u0111\u00e1nh gi\u00e1 th\u1ee7 c\u00f4ng h\u01a1n. M\u1ee5c ti\u00eau kh\u00f4ng ph\u1ea3i x\u00f3a m\u1ecdi trang c\u00f3 c\u1ea5u tr\u00fac gi\u1ed1ng nhau, m\u00e0 l\u00e0 x\u00e1c \u0111\u1ecbnh nh\u1eefng URL c\u00f3 ph\u1ea7n n\u1ed9i dung ch\u00ednh v\u00e0 m\u1ee5c \u0111\u00edch t\u00ecm ki\u1ebfm qu\u00e1 gi\u1ed1ng nhau.<\/p>\n<p>Khi audit, n\u00ean b\u1ecf ch\u1ecdn thi\u1ebft l\u1eadp \u201cOnly check indexable pages\u201d n\u1ebfu mu\u1ed1n ki\u1ec3m tra c\u1ea3 c\u00e1c trang non-indexable. M\u1ed9t URL c\u00f3 noindex v\u1eabn c\u00f3 th\u1ec3 ti\u00eau t\u1ed1n crawl budget n\u1ebfu Googlebot ti\u1ebfp t\u1ee5c truy c\u1eadp. Vi\u1ec7c nh\u00ecn th\u1ea5y nh\u00f3m URL n\u00e0y gi\u00fap \u0111\u00e1nh gi\u00e1 hi\u1ec7u qu\u1ea3 crawl c\u1ee7a to\u00e0n website, thay v\u00ec ch\u1ec9 quan s\u00e1t nh\u1eefng trang \u0111ang \u0111\u01b0\u1ee3c index.<\/p>\n<h3>Siteliner, Copyscape v\u00e0 ki\u1ec3m tra th\u1ee7 c\u00f4ng<\/h3>\n<p>Siteliner v\u00e0 Copyscape gi\u1ea3i quy\u1ebft hai g\u00f3c kh\u00e1c nhau c\u1ee7a v\u1ea5n \u0111\u1ec1. Siteliner t\u1eadp trung v\u00e0o t\u1ef7 l\u1ec7 n\u1ed9i dung tr\u00f9ng l\u1eb7p b\u00ean trong website, c\u00f2n Copyscape t\u00ecm c\u00e1c b\u1ea3n sao xu\u1ea5t hi\u1ec7n tr\u00ean domain kh\u00e1c.<\/p>\n<p>C\u00f3 th\u1ec3 b\u1ed5 sung b\u1eb1ng hai c\u00e1ch ki\u1ec3m tra th\u1ee7 c\u00f4ng:<\/p>\n<ul>\n<li>D\u00f9ng truy v\u1ea5n <code>site:domain.com<\/code> \u0111\u1ec3 quan s\u00e1t nh\u1eefng URL Google \u0111ang index tr\u00ean website.<\/li>\n<li>Sao ch\u00e9p m\u1ed9t \u0111o\u1ea1n v\u0103n \u0111\u1eb7c tr\u01b0ng v\u00e0 t\u00ecm ki\u1ebfm d\u01b0\u1edbi d\u1ea1ng <code>\"[\u0111o\u1ea1n v\u0103n \u0111\u1ed9c \u0111\u00e1o t\u1eeb trang]\"<\/code> \u0111\u1ec3 ph\u00e1t hi\u1ec7n b\u1ea3n sao b\u00ean ngo\u00e0i.<\/li>\n<\/ul>\n<p>Ki\u1ec3m tra th\u1ee7 c\u00f4ng kh\u00f4ng thay th\u1ebf \u0111\u01b0\u1ee3c qu\u00e1 tr\u00ecnh crawl. Tuy nhi\u00ean, \u0111\u00e2y l\u00e0 c\u00e1ch nhanh \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh m\u1ed9t n\u1ed9i dung \u0111\u00e3 b\u1ecb sao ch\u00e9p, ph\u00e2n ph\u1ed1i l\u1ea1i ho\u1eb7c \u0111\u01b0\u1ee3c Google ghi nh\u1eadn d\u01b0\u1edbi nhi\u1ec1u URL ngo\u00e0i d\u1ef1 ki\u1ebfn.<\/p>\n<h2>C\u00e1ch kh\u1eafc ph\u1ee5c Duplicate Content<\/h2>\n<p>Kh\u00f4ng c\u00f3 m\u1ed9t gi\u1ea3i ph\u00e1p d\u00f9ng chung cho m\u1ecdi URL tr\u00f9ng l\u1eb7p. Canonical, 301 redirect, noindex v\u00e0 c\u1ea5u h\u00ecnh tham s\u1ed1 ph\u1ee5c v\u1ee5 nh\u1eefng m\u1ee5c ti\u00eau kh\u00e1c nhau. Ch\u1ecdn sai k\u1ef9 thu\u1eadt c\u00f3 th\u1ec3 l\u00e0m m\u1ea5t m\u1ed9t trang c\u1ea7n thi\u1ebft ho\u1eb7c \u0111\u1ec3 l\u1ea1i t\u00edn hi\u1ec7u m\u00e2u thu\u1eabn cho search engine.<\/p>\n<h3>Th\u1ebb canonical \u2014 Ch\u1ec9 \u0111\u1ecbnh URL \u01b0u ti\u00ean cho search engine<\/h3>\n<p>Th\u1ebb canonical \u0111\u01b0\u1ee3c \u0111\u1eb7t trong ph\u1ea7n <code>&lt;head&gt;<\/code> c\u1ee7a trang:<\/p>\n<p><code>&lt;link rel=\"canonical\" href=\"URL-\u01b0u-ti\u00ean\"&gt;<\/code><\/p>\n<p>T\u00edn hi\u1ec7u n\u00e0y cho search engine bi\u1ebft URL n\u00e0o n\u00ean \u0111\u01b0\u1ee3c xem l\u00e0 phi\u00ean b\u1ea3n ch\u00ednh. Khi \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn, canonical gi\u00fap h\u1ee3p nh\u1ea5t link equity v\u00e0 gi\u1ea3m kh\u1ea3 n\u0103ng URL ph\u1ee5 xu\u1ea5t hi\u1ec7n tr\u00ean k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm.<\/p>\n<p>Tuy nhi\u00ean, canonical l\u00e0 m\u1ed9t t\u00edn hi\u1ec7u g\u1ee3i \u00fd, kh\u00f4ng ph\u1ea3i m\u1ec7nh l\u1ec7nh tuy\u1ec7t \u0111\u1ed1i. Google c\u00f3 th\u1ec3 b\u1ecf qua n\u1ebfu sitemap, internal link, redirect ho\u1eb7c n\u1ed9i dung cho th\u1ea5y m\u1ed9t URL kh\u00e1c ph\u00f9 h\u1ee3p h\u01a1n. V\u00ec v\u1eady, vi\u1ec7c tri\u1ec3n khai <a href=\"https:\/\/vbaseup.com\/kien-thuc\/canonical\/\">canonical tag<\/a> ph\u1ea3i \u0111i c\u00f9ng h\u1ec7 th\u1ed1ng t\u00edn hi\u1ec7u nh\u1ea5t qu\u00e1n.<\/p>\n<p>M\u1ed7i trang ch\u00ednh n\u00ean c\u00f3 self-referencing canonical, ngh\u0129a l\u00e0 canonical tr\u1ecf v\u1ec1 ch\u00ednh URL c\u1ee7a trang \u0111\u00f3. N\u1ebfu m\u1ed9t scraper sao ch\u00e9p to\u00e0n b\u1ed9 HTML, th\u1ebb canonical \u0111\u01b0\u1ee3c sao ch\u00e9p theo v\u1eabn tr\u1ecf v\u1ec1 URL g\u1ed1c v\u00e0 g\u00f3p ph\u1ea7n gi\u00fap search engine nh\u1eadn di\u1ec7n ngu\u1ed3n.<\/p>\n<p>Canonical ph\u00f9 h\u1ee3p khi nhi\u1ec1u URL v\u1eabn c\u1ea7n \u0111\u01b0\u1ee3c truy c\u1eadp, ch\u1eb3ng h\u1ea1n phi\u00ean b\u1ea3n d\u00f9ng cho A\/B testing, b\u1ea3n th\u00e2n thi\u1ec7n v\u1edbi m\u00e1y in ho\u1eb7c c\u00e1c bi\u1ebfn th\u1ec3 s\u1ea3n ph\u1ea9m. URL ph\u1ee5 \u0111\u01b0\u1ee3c gi\u1eef l\u1ea1i, nh\u01b0ng t\u00edn hi\u1ec7u x\u1ebfp h\u1ea1ng \u0111\u01b0\u1ee3c h\u01b0\u1edbng v\u1ec1 m\u1ed9t URL \u0111\u1ea1i di\u1ec7n.<\/p>\n<h3>301 Redirect \u2014 H\u1ee3p nh\u1ea5t URL duplicate v\u0129nh vi\u1ec5n<\/h3>\n<p>301 redirect l\u00e0 l\u1ef1a ch\u1ecdn d\u1ee9t kho\u00e1t khi URL ph\u1ee5 kh\u00f4ng c\u00f2n l\u00fd do t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp. Chuy\u1ec3n h\u01b0\u1edbng n\u00e0y b\u00e1o cho search engine r\u1eb1ng t\u00e0i nguy\u00ean \u0111\u00e3 \u0111\u01b0\u1ee3c chuy\u1ec3n v\u0129nh vi\u1ec5n v\u00e0 t\u00edn hi\u1ec7u li\u00ean k\u1ebft n\u00ean \u0111\u01b0\u1ee3c h\u1ee3p nh\u1ea5t v\u1ec1 URL \u0111\u00edch.<\/p>\n<p>C\u00e1c tr\u01b0\u1eddng h\u1ee3p ph\u00f9 h\u1ee3p g\u1ed3m:<\/p>\n<ul>\n<li>Migration t\u1eeb HTTP sang HTTPS.<\/li>\n<li>H\u1ee3p nh\u1ea5t WWW v\u00e0 non-WWW.<\/li>\n<li>Lo\u1ea1i b\u1ecf URL tham s\u1ed1 kh\u00f4ng c\u1ea7n thi\u1ebft.<\/li>\n<li>G\u1ed9p c\u00e1c trang s\u1ea3n ph\u1ea9m tr\u00f9ng l\u1eb7p.<\/li>\n<li>Thay th\u1ebf URL c\u0169 b\u1eb1ng c\u1ea5u tr\u00fac URL m\u1edbi.<\/li>\n<\/ul>\n<p>So v\u1edbi canonical, 301 redirect m\u1ea1nh h\u01a1n v\u00ec ng\u01b0\u1eddi d\u00f9ng v\u00e0 search engine \u0111\u1ec1u \u0111\u01b0\u1ee3c chuy\u1ec3n sang URL m\u1edbi. URL c\u0169 d\u1ea7n r\u1eddi kh\u1ecfi index, trong khi ph\u1ea7n l\u1edbn link equity \u0111\u01b0\u1ee3c truy\u1ec1n v\u1ec1 URL \u0111\u00edch. N\u1ebfu URL ph\u1ee5 v\u1eabn c\u1ea7n ph\u1ee5c v\u1ee5 ng\u01b0\u1eddi d\u00f9ng, canonical s\u1ebd linh ho\u1ea1t h\u01a1n.<\/p>\n<h3>Th\u1ebb meta robots noindex \u2014 Lo\u1ea1i trang kh\u1ecfi ch\u1ec9 m\u1ee5c<\/h3>\n<p>Th\u1ebb sau y\u00eau c\u1ea7u search engine kh\u00f4ng \u0111\u01b0a URL v\u00e0o ch\u1ec9 m\u1ee5c:<\/p>\n<p><code>&lt;meta name=\"robots\" content=\"noindex\"&gt;<\/code><\/p>\n<p>Noindex ph\u00f9 h\u1ee3p v\u1edbi nh\u1eefng trang v\u1eabn c\u1ea7n ho\u1ea1t \u0111\u1ed9ng nh\u01b0ng kh\u00f4ng n\u00ean xu\u1ea5t hi\u1ec7n tr\u00ean SERP, ch\u1eb3ng h\u1ea1n trang tag, archive ho\u1eb7c k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm n\u1ed9i b\u1ed9.<\/p>\n<p>Noindex v\u00e0 canonical kh\u00f4ng c\u00f3 c\u00f9ng m\u1ee5c ti\u00eau. Noindex lo\u1ea1i trang kh\u1ecfi ch\u1ec9 m\u1ee5c, c\u00f2n canonical h\u1ee3p nh\u1ea5t t\u00edn hi\u1ec7u c\u1ee7a trang ph\u1ee5 v\u1ec1 m\u1ed9t URL ch\u00ednh. N\u1ebfu m\u1ed9t URL c\u00f3 gi\u00e1 tr\u1ecb li\u00ean k\u1ebft c\u1ea7n \u0111\u01b0\u1ee3c b\u1ea3o to\u00e0n, canonical ho\u1eb7c redirect th\u01b0\u1eddng ph\u00f9 h\u1ee3p h\u01a1n.<\/p>\n<p>Kh\u00f4ng n\u00ean d\u00f9ng robots.txt \u0111\u1ec3 ch\u1eb7n m\u1ed9t URL n\u1ebfu Googlebot c\u1ea7n \u0111\u1ecdc canonical ho\u1eb7c noindex tr\u00ean trang \u0111\u00f3. Khi b\u1ecb ch\u1eb7n crawl, bot kh\u00f4ng nh\u00ecn th\u1ea5y t\u00edn hi\u1ec7u trong HTML. URL v\u1eabn c\u00f3 kh\u1ea3 n\u0103ng \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u00e0 index th\u00f4ng qua backlink, nh\u01b0ng search engine l\u1ea1i thi\u1ebfu th\u00f4ng tin \u0111\u1ec3 x\u1eed l\u00fd \u0111\u00fang.<\/p>\n<h2>C\u00e1c ph\u01b0\u01a1ng ph\u00e1p t\u1ed1t nh\u1ea5t \u0111\u1ec3 ph\u00f2ng ng\u1eeba Duplicate Content<\/h2>\n<p>Ph\u00f2ng ng\u1eeba duplicate content th\u01b0\u1eddng \u00edt t\u1ed1n k\u00e9m h\u01a1n x\u1eed l\u00fd sau khi h\u00e0ng ngh\u00ecn URL \u0111\u00e3 \u0111\u01b0\u1ee3c crawl. N\u1ec1n t\u1ea3ng n\u1eb1m \u1edf c\u00e1ch CMS t\u1ea1o URL v\u00e0 c\u00e1ch website g\u1eedi t\u00edn hi\u1ec7u ngay t\u1eeb l\u00fac xu\u1ea5t b\u1ea3n.<\/p>\n<ul>\n<li><strong>Thi\u1ebft l\u1eadp canonical cho m\u1ecdi trang:<\/strong> M\u1ed7i URL ch\u00ednh n\u00ean c\u00f3 self-referencing canonical. C\u00e1c phi\u00ean b\u1ea3n ph\u1ee5 c\u1ea7n tr\u1ecf v\u1ec1 \u0111\u00fang URL \u0111\u1ea1i di\u1ec7n.<\/li>\n<li><strong>Nh\u1ea5t qu\u00e1n internal linking:<\/strong> M\u1ecdi li\u00ean k\u1ebft n\u1ed9i b\u1ed9 n\u00ean d\u00f9ng c\u00f9ng m\u1ed9t phi\u00ean b\u1ea3n giao th\u1ee9c, subdomain, ch\u1eef hoa ho\u1eb7c ch\u1eef th\u01b0\u1eddng v\u00e0 d\u1ea5u g\u1ea1ch ch\u00e9o cu\u1ed1i.<\/li>\n<li><strong>B\u1ea3o v\u1ec7 staging v\u00e0 development site:<\/strong> S\u1eed d\u1ee5ng m\u1eadt kh\u1ea9u ho\u1eb7c bi\u1ec7n ph\u00e1p ch\u1eb7n ph\u00f9 h\u1ee3p \u0111\u1ec3 m\u00f4i tr\u01b0\u1eddng th\u1eed nghi\u1ec7m kh\u00f4ng b\u1ecb index song song v\u1edbi website ch\u00ednh.<\/li>\n<li><strong>Vi\u1ebft m\u00f4 t\u1ea3 s\u1ea3n ph\u1ea9m \u0111\u1ed9c \u0111\u00e1o:<\/strong> Kh\u00f4ng ph\u1ee5 thu\u1ed9c ho\u00e0n to\u00e0n v\u00e0o n\u1ed9i dung do nh\u00e0 s\u1ea3n xu\u1ea5t cung c\u1ea5p. M\u1ed7i trang c\u1ea7n th\u1ec3 hi\u1ec7n gi\u00e1 tr\u1ecb v\u00e0 th\u00f4ng tin ri\u00eang.<\/li>\n<li><strong>D\u00f9ng hreflang \u0111\u00fang cho trang \u0111a ng\u00f4n ng\u1eef ho\u1eb7c khu v\u1ef1c:<\/strong> C\u00e1c phi\u00ean b\u1ea3n c\u1ea7n \u0111\u01b0\u1ee3c li\u00ean k\u1ebft nh\u1ea5t qu\u00e1n \u0111\u1ec3 search engine hi\u1ec3u \u0111\u00fang th\u1ecb tr\u01b0\u1eddng v\u00e0 ng\u00f4n ng\u1eef m\u1ee5c ti\u00eau.<\/li>\n<li><strong>Qu\u1ea3n l\u00fd URL parameters t\u1eeb s\u1edbm:<\/strong> C\u1ea5u h\u00ecnh h\u1ec7 th\u1ed1ng l\u1ecdc v\u00e0 tham s\u1ed1 tr\u01b0\u1edbc khi website ph\u00e1t tri\u1ec3n \u0111\u1ebfn quy m\u00f4 kh\u00f3 ki\u1ec3m so\u00e1t.<\/li>\n<\/ul>\n<p>Website c\u0169ng n\u00ean th\u1ef1c hi\u1ec7n audit Content SEO \u0111\u1ecbnh k\u1ef3 t\u1eeb ba \u0111\u1ebfn s\u00e1u th\u00e1ng m\u1ed9t l\u1ea7n b\u1eb1ng Screaming Frog, Semrush ho\u1eb7c Ahrefs Site Audit. CMS update, thay \u0111\u1ed5i danh m\u1ee5c v\u00e0 landing page chi\u1ebfn d\u1ecbch c\u00f3 th\u1ec3 t\u1ea1o duplicate content m\u1edbi. \u0110\u1eb7c bi\u1ec7t, c\u00e1c trang chi\u1ebfn d\u1ecbch ch\u1ec9 kh\u00e1c ti\u00eau \u0111\u1ec1 ho\u1eb7c h\u00ecnh \u1ea3nh nh\u01b0ng ph\u1ee5c v\u1ee5 c\u00f9ng search intent th\u01b0\u1eddng b\u1ecb b\u1ecf qu\u00ean sau khi chi\u1ebfn d\u1ecbch k\u1ebft th\u00fac.<\/p>\n<h2>Duplicate Content \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn AI Search v\u00e0 t\u00ecm ki\u1ebfm t\u1ed5ng h\u1ee3p nh\u01b0 th\u1ebf n\u00e0o?<\/h2>\n<p>Trong m\u00f4i tr\u01b0\u1eddng AI Search, duplicate content t\u1ea1o th\u00eam m\u1ed9t r\u1ee7i ro: h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 ch\u1ecdn sai URL l\u00e0m ngu\u1ed3n tr\u00edch d\u1eabn ho\u1eb7c s\u1eed d\u1ee5ng m\u1ed9t phi\u00ean b\u1ea3n n\u1ed9i dung \u0111\u00e3 l\u1ed7i th\u1eddi. Website kh\u00f4ng ch\u1ec9 c\u1ea1nh tranh \u0111\u1ec3 x\u1ebfp h\u1ea1ng m\u00e0 c\u00f2n c\u1ea1nh tranh \u0111\u1ec3 tr\u1edf th\u00e0nh ngu\u1ed3n \u0111\u01b0\u1ee3c AI nh\u1eadn di\u1ec7n.<\/p>\n<h3>AI v\u00e0 LLM cluster URL g\u1ea7n tr\u00f9ng l\u1eb7p \u2014 ch\u1ecdn m\u1ed9t ngu\u1ed3n \u0111\u1ea1i di\u1ec7n<\/h3>\n<p>C\u00e1c h\u1ec7 th\u1ed1ng AI Search nh\u01b0 Bing AI v\u00e0 Google AI Overviews c\u00f3 th\u1ec3 nh\u00f3m nh\u1eefng URL g\u1ea7n tr\u00f9ng l\u1eb7p r\u1ed3i ch\u1ecdn m\u1ed9t ngu\u1ed3n \u0111\u1ea1i di\u1ec7n \u0111\u1ec3 l\u00e0m c\u0103n c\u1ee9 cho c\u00e2u tr\u1ea3 l\u1eddi. Logic n\u00e0y t\u01b0\u01a1ng t\u1ef1 qu\u00e1 tr\u00ecnh ch\u1ecdn canonical trong SEO truy\u1ec1n th\u1ed1ng: nhi\u1ec1u URL n\u00f3i c\u00f9ng m\u1ed9t \u0111i\u1ec1u nh\u01b0ng ch\u1ec9 m\u1ed9t s\u1ed1 URL c\u00f3 c\u01a1 h\u1ed9i \u0111\u01b0\u1ee3c tr\u00edch d\u1eabn.<\/p>\n<p>Bing Webmaster Blog v\u00e0o th\u00e1ng 12\/2025 x\u00e1c nh\u1eadn AI systems cluster near-duplicate URLs v\u00e0 l\u1ef1a ch\u1ecdn URL \u0111\u1ea1i di\u1ec7n l\u00e0m citation source. Nh\u1eefng URL kh\u00f4ng \u0111\u01b0\u1ee3c ch\u1ecdn c\u00f3 th\u1ec3 m\u1ea5t c\u01a1 h\u1ed9i xu\u1ea5t hi\u1ec7n trong c\u00e2u tr\u1ea3 l\u1eddi do AI t\u1ea1o ra, d\u00f9 n\u1ed9i dung v\u1ec1 c\u01a1 b\u1ea3n ch\u00ednh x\u00e1c.<\/p>\n<p>R\u1ee7i ro t\u0103ng l\u00ean khi m\u1ed9t b\u00e0i vi\u1ebft \u0111\u01b0\u1ee3c syndication tr\u00ean website c\u00f3 authority cao h\u01a1n nh\u01b0ng kh\u00f4ng c\u00f3 canonical attribution. AI c\u00f3 th\u1ec3 xem b\u1ea3n ph\u00e2n ph\u1ed1i l\u1ea1i l\u00e0 ngu\u1ed3n ch\u00ednh v\u00e0 tr\u00edch d\u1eabn n\u00f3 thay v\u00ec URL g\u1ed1c. Canonical r\u00f5 r\u00e0ng c\u00f9ng attribution nh\u1ea5t qu\u00e1n gi\u00fap search index nh\u1eadn di\u1ec7n ngu\u1ed3n \u0111\u1ea1i di\u1ec7n t\u1ed1t h\u01a1n.<\/p>\n<h3>T\u00edn hi\u1ec7u kh\u00f4ng nh\u1ea5t qu\u00e1n l\u00e0m gi\u1ea3m \u0111\u1ed9 tin c\u1eady trong AI citation<\/h3>\n<p>AI c\u1ea7n x\u00e1c \u0111\u1ecbnh phi\u00ean b\u1ea3n th\u00f4ng tin n\u00e0o \u0111\u00e1ng tin c\u1eady. Khi nhi\u1ec1u URL c\u00f9ng n\u00f3i v\u1ec1 m\u1ed9t s\u1ea3n ph\u1ea9m nh\u01b0ng kh\u00e1c ng\u00e0y c\u1eadp nh\u1eadt, metadata, schema ho\u1eb7c gi\u00e1 b\u00e1n, h\u1ec7 th\u1ed1ng nh\u1eadn \u0111\u01b0\u1ee3c nh\u1eefng t\u00edn hi\u1ec7u m\u00e2u thu\u1eabn.<\/p>\n<p>V\u00ed d\u1ee5, URL A ghi gi\u00e1 X trong khi URL B c\u1ee7a c\u00f9ng s\u1ea3n ph\u1ea9m ghi gi\u00e1 Y do hai bi\u1ebfn th\u1ec3 tr\u00f9ng l\u1eb7p kh\u00f4ng \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd \u0111\u00fang. AI c\u00f3 th\u1ec3 ch\u1ecdn sai phi\u00ean b\u1ea3n, d\u00f9ng d\u1eef li\u1ec7u c\u0169 ho\u1eb7c b\u1ecf qua website v\u00ec kh\u00f4ng x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c ngu\u1ed3n n\u00e0o c\u00f3 th\u1ea9m quy\u1ec1n.<\/p>\n<p>Sau khi URL duplicate \u0111\u01b0\u1ee3c h\u1ee3p nh\u1ea5t, c\u1eadp nh\u1eadt ho\u1eb7c x\u00f3a, IndexNow c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 th\u00f4ng b\u00e1o thay \u0111\u1ed5i cho Bing. C\u01a1 ch\u1ebf n\u00e0y gi\u00fap r\u00fat ng\u1eafn th\u1eddi gian h\u1ec7 th\u1ed1ng t\u00ecm ki\u1ebfm v\u00e0 AI gi\u1eef phi\u00ean b\u1ea3n c\u0169 trong b\u1ed9 nh\u1edb \u0111\u1ec7m, \u0111\u1eb7c bi\u1ec7t sau khi website s\u1eeda canonical ho\u1eb7c lo\u1ea1i b\u1ecf URL kh\u00f4ng c\u00f2n h\u1ee3p l\u1ec7.<\/p>\n<h3>Canonical tag v\u00e0 kho\u1ea3ng c\u00e1ch v\u1edbi m\u00f4 h\u00ecnh ng\u00f4n ng\u1eef l\u1edbn (LLM)<\/h3>\n<p>LLM kh\u00f4ng nh\u1ea5t thi\u1ebft crawl v\u00e0 x\u1eed l\u00fd canonical tag tr\u1ef1c ti\u1ebfp theo c\u00e1ch Googlebot l\u00e0m. Ch\u00fang th\u01b0\u1eddng d\u1ef1a v\u00e0o d\u1eef li\u1ec7u hu\u1ea5n luy\u1ec7n ho\u1eb7c l\u1edbp truy xu\u1ea5t th\u1eddi gian th\u1ef1c t\u1eeb search index \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh ngu\u1ed3n c\u00f3 th\u1ea9m quy\u1ec1n.<\/p>\n<p>V\u00ec v\u1eady, ch\u1ec9 \u0111\u1eb7t th\u1ebb canonical trong m\u00e3 ngu\u1ed3n ch\u01b0a \u0111\u1ee7. \u0110i\u1ec1u quan tr\u1ecdng l\u00e0 canonical \u0111\u00f3 ph\u1ea3i \u0111\u01b0\u1ee3c Google ho\u1eb7c Bing c\u00f4ng nh\u1eadn. URL \u0111\u01b0\u1ee3c ch\u1ecdn trong search index m\u1edbi l\u00e0 phi\u00ean b\u1ea3n m\u00e0 l\u1edbp truy xu\u1ea5t c\u1ee7a AI c\u00f3 kh\u1ea3 n\u0103ng nh\u00ecn th\u1ea5y v\u00e0 tr\u00edch d\u1eabn.<\/p>\n<p>Chi\u1ebfn l\u01b0\u1ee3c \u0111\u00fang g\u1ed3m ba ph\u1ea7n: ki\u1ec3m tra canonical \u0111\u01b0\u1ee3c search engine th\u1ef1c s\u1ef1 ch\u1ecdn, gi\u1eef internal link nh\u1ea5t qu\u00e1n v\u1ec1 URL \u0111\u00f3 v\u00e0 t\u1ea1o kh\u00e1c bi\u1ec7t n\u1ed9i dung \u0111\u1ee7 r\u00f5 gi\u1eefa c\u00e1c trang c\u1ea7n t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp. Tr\u1ea1ng th\u00e1i \u201cGoogle chose different canonical\u201d trong Google Search Console l\u00e0 d\u1ea5u hi\u1ec7u \u0111\u1ea7u ti\u00ean c\u1ea7n ki\u1ec3m tra khi URL mong mu\u1ed1n kh\u00f4ng xu\u1ea5t hi\u1ec7n trong k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm ho\u1eb7c AI citation.<\/p>\n<h2>T\u1ed5ng k\u1ebft v\u1ec1 Duplicate Content SEO<\/h2>\n<p>Duplicate content SEO c\u1ea7n \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd ch\u1ee7 \u0111\u1ed9ng, kh\u00f4ng ph\u1ea3i v\u00ec m\u1ecdi n\u1ed9i dung tr\u00f9ng l\u1eb7p \u0111\u1ec1u b\u1ecb ph\u1ea1t, m\u00e0 v\u00ec website c\u1ea7n b\u1ea3o to\u00e0n crawl budget, link equity v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a ngu\u1ed3n \u0111\u01b0\u1ee3c AI tr\u00edch d\u1eabn.<\/p>\n<p>Ba \u01b0u ti\u00ean x\u1eed l\u00fd n\u00ean \u0111i theo m\u1ee9c \u0111\u1ed9 \u1ea3nh h\u01b0\u1edfng. Tr\u01b0\u1edbc h\u1ebft, h\u1ee3p nh\u1ea5t c\u00e1c bi\u1ebfn th\u1ec3 HTTP, HTTPS, WWW v\u00e0 non-WWW b\u1eb1ng redirect. Ti\u1ebfp theo, thi\u1ebft l\u1eadp <a href=\"https:\/\/vbaseup.com\/kien-thuc\/canonical\/\">canonical<\/a> cho trang th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed v\u00e0 c\u00e1c URL do CMS t\u1ea1o ra. Cu\u1ed1i c\u00f9ng, audit \u0111\u1ecbnh k\u1ef3 \u0111\u1ec3 ph\u00e1t hi\u1ec7n n\u1ed9i dung tr\u00f9ng l\u1eb7p m\u1edbi t\u1eeb chi\u1ebfn d\u1ecbch, b\u1ed9 l\u1ecdc ho\u1eb7c thay \u0111\u1ed5i c\u1ea5u tr\u00fac website.<\/p>\n<p>Trong b\u1ed1i c\u1ea3nh AI Search 2025\u20132026, hai y\u1ebfu t\u1ed1 ng\u00e0y c\u00e0ng quan tr\u1ecdng l\u00e0 t\u00edn hi\u1ec7u canonical nh\u1ea5t qu\u00e1n v\u00e0 n\u1ed9i dung c\u00f3 kh\u00e1c bi\u1ec7t r\u00f5 r\u00e0ng. Khi ngu\u1ed3n b\u1ecb m\u1edd \u0111i gi\u1eefa nhi\u1ec1u b\u1ea3n sao, AI c\u00f3 th\u1ec3 tr\u00edch d\u1eabn sai URL ho\u1eb7c b\u1ecf qua website ho\u00e0n to\u00e0n.<\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 Duplicate Content SEO<\/h2>\n<h4>Duplicate content c\u00f3 l\u00e0m gi\u1ea3m th\u1ee9 h\u1ea1ng Google kh\u00f4ng?<\/h4>\n<p>Kh\u00f4ng tr\u1ef1c ti\u1ebfp. Google kh\u00f4ng \u00e1p d\u1ee5ng m\u1ed9t h\u00ecnh ph\u1ea1t t\u1ef1 \u0111\u1ed9ng ch\u1ec9 v\u00ec website c\u00f3 duplicate content th\u00f4ng th\u01b0\u1eddng. Tuy nhi\u00ean, n\u1ed9i dung tr\u00f9ng l\u1eb7p c\u00f3 th\u1ec3 gi\u00e1n ti\u1ebfp l\u00e0m suy y\u1ebfu kh\u1ea3 n\u0103ng x\u1ebfp h\u1ea1ng do link equity b\u1ecb ph\u00e2n t\u00e1n, crawl budget b\u1ecb l\u00e3ng ph\u00ed v\u00e0 Google ch\u1ecdn sai URL \u0111\u1ea1i di\u1ec7n. K\u1ebft qu\u1ea3 cu\u1ed1i c\u00f9ng c\u00f3 th\u1ec3 l\u00e0 URL mong mu\u1ed1n kh\u00f4ng \u0111\u01b0\u1ee3c x\u1ebfp h\u1ea1ng, d\u00f9 website kh\u00f4ng nh\u1eadn b\u1ea5t k\u1ef3 \u201c\u0111i\u1ec3m ph\u1ea1t\u201d n\u00e0o.<\/p>\n<h4>Google c\u00f3 t\u1ef1 x\u1eed l\u00fd duplicate content kh\u00f4ng?<\/h4>\n<p>C\u00f3. Trong ph\u1ea7n l\u1edbn tr\u01b0\u1eddng h\u1ee3p, Google t\u1ef1 nh\u00f3m c\u00e1c URL tr\u00f9ng l\u1eb7p v\u00e0 ch\u1ecdn m\u1ed9t URL l\u00e0m canonical. Gi\u1edbi h\u1ea1n n\u1eb1m \u1edf ch\u1ed7 URL \u0111\u01b0\u1ee3c Google ch\u1ecdn c\u00f3 th\u1ec3 kh\u00f4ng ph\u1ea3i phi\u00ean b\u1ea3n ch\u1ee7 website mong mu\u1ed1n. N\u1ebfu kh\u00f4ng c\u00f3 canonical, redirect v\u00e0 internal link nh\u1ea5t qu\u00e1n, quy\u1ec1n quy\u1ebft \u0111\u1ecbnh g\u1ea7n nh\u01b0 thu\u1ed9c v\u1ec1 thu\u1eadt to\u00e1n c\u1ee7a Google.<\/p>\n<h4>Canonical tag c\u00f3 \u0111\u1ea3m b\u1ea3o Google ch\u1ecdn \u0111\u00fang URL kh\u00f4ng?<\/h4>\n<p>Kh\u00f4ng. Canonical l\u00e0 t\u00edn hi\u1ec7u g\u1ee3i \u00fd, kh\u00f4ng ph\u1ea3i l\u1ec7nh b\u1eaft bu\u1ed9c. Google c\u00f3 th\u1ec3 ch\u1ecdn URL kh\u00e1c n\u1ebfu internal link, backlink, sitemap ho\u1eb7c n\u1ed9i dung ph\u00e1t \u0111i t\u00edn hi\u1ec7u m\u1ea1nh h\u01a1n. Khi canonical b\u1ecb b\u1ecf qua, c\u1ea7n ki\u1ec3m tra to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng t\u00edn hi\u1ec7u thay v\u00ec ch\u1ec9 ki\u1ec3m tra s\u1ef1 hi\u1ec7n di\u1ec7n c\u1ee7a th\u1ebb trong m\u00e3 ngu\u1ed3n.<\/p>\n<h4>N\u1ed9i dung syndication c\u00f3 b\u1ecb coi l\u00e0 duplicate content kh\u00f4ng?<\/h4>\n<p>C\u00f3. N\u1ed9i dung \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i l\u1ea1i v\u1eabn l\u00e0 duplicate content v\u00ec c\u00f9ng m\u1ed9t n\u1ed9i dung xu\u1ea5t hi\u1ec7n tr\u00ean nhi\u1ec1u domain. Tuy nhi\u00ean, syndication h\u1ee3p l\u1ec7 c\u00f3 canonical attribution tr\u1ecf v\u1ec1 URL g\u1ed1c ho\u1eb7c noindex tr\u00ean b\u1ea3n ph\u00e2n ph\u1ed1i th\u01b0\u1eddng kh\u00f4ng g\u00e2y h\u1ea1i cho trang g\u1ed1c. R\u1ee7i ro l\u1edbn h\u01a1n xu\u1ea5t hi\u1ec7n khi n\u1ed9i dung b\u1ecb sao ch\u00e9p ho\u1eb7c ph\u00e2n ph\u1ed1i m\u00e0 kh\u00f4ng c\u00f3 quy\u1ec1n, attribution hay t\u00edn hi\u1ec7u ngu\u1ed3n r\u00f5 r\u00e0ng.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Duplicate content SEO xu\u1ea5t hi\u1ec7n khi c\u00f9ng m\u1ed9t n\u1ed9i dung t\u1ed3n t\u1ea1i tr\u00ean nhi\u1ec1u URL, d\u00f9 c\u00e1c URL \u0111\u00f3 thu\u1ed9c c\u00f9ng m\u1ed9t website hay n\u1eb1m tr\u00ean nh\u1eefng domain kh\u00e1c nhau. V\u1ea5n \u0111\u1ec1 kh\u00f4ng n\u1eb1m \u1edf vi\u1ec7c m\u1ed9t \u0111o\u1ea1n v\u0103n \u0111\u01b0\u1ee3c l\u1eb7p l\u1ea1i \u0111\u01a1n thu\u1ea7n. \u0110i\u1ec1u \u0111\u00e1ng lo l\u00e0 search engine ph\u1ea3i quy\u1ebft \u0111\u1ecbnh URL n\u00e0o [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3442,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14,19],"tags":[18],"class_list":["post-3454","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","category-content-seo","tag-content-seo"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/vbaseup.com\/kien-thuc\/wp-json\/wp\/v2\/posts\/3454","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vbaseup.com\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vbaseup.com\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vbaseup.com\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vbaseup.com\/kien-thuc\/wp-json\/wp\/v2\/comments?post=3454"}],"version-history":[{"count":2,"href":"https:\/\/vbaseup.com\/kien-thuc\/wp-json\/wp\/v2\/posts\/3454\/revisions"}],"predecessor-version":[{"id":3456,"href":"https:\/\/vbaseup.com\/kien-thuc\/wp-json\/wp\/v2\/posts\/3454\/revisions\/3456"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vbaseup.com\/kien-thuc\/wp-json\/wp\/v2\/media\/3442"}],"wp:attachment":[{"href":"https:\/\/vbaseup.com\/kien-thuc\/wp-json\/wp\/v2\/media?parent=3454"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vbaseup.com\/kien-thuc\/wp-json\/wp\/v2\/categories?post=3454"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vbaseup.com\/kien-thuc\/wp-json\/wp\/v2\/tags?post=3454"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}