This webpage has alternate versions available in Vietnamese via the use of the hreflang tag.
https://support.google.com/webmasters/answer/189077?hl=en
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Get access to data on 401,226 websites that are Vietnamese HREF LANG Customers. We know of 196,685 live websites using Vietnamese HREF LANG and an additional 204,541 sites that used Vietnamese HREF LANG historically and 87,306 websites in the United States.
Get a list of 401,226 websites using Vietnamese HREF LANG which includes location information, hosting data, contact details, 196,685 currently live websites and an additional 344,826 domains that redirect to sites in this list. 204,541 sites that used this technology previouslyand 87,306 websites in the United States currently using Vietnamese HREF LANG.
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