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Hello, Pezza_NZ.
Welcome to Microsoft Community!
Regarding the issue of language support for Copilot Studio that you mentioned, the Microsoft forums can only look at the official articles to see when the new language support will be released, and the only source we know of is the official article description, which can be found at:
Language support - Microsoft Copilot Studio | Microsoft Learn
In the meantime, we've found that there are currently two types of Chinese language support, one for Chinese(traditional), and anotherfor Chinese(Simplified), and it does seem that the Vietnamese language has not yet been added. Any further updates will be posted in the article above, where you can find them, and you can also express your requests in the feedback section at the bottom of the article above.
Best Regards,
Airy-MSFT | Microsoft Community Support Specialist