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I already have SynthV Pro and have used Teto to cover many songs. Now I'm looking into how to make Teto sing/speak Vietnamese to cover my favorite songs. Can anyone share how to get Kasane Teto to sing/speak Vietnamese so I can expand my knowledge and share it with others who are also learning?
All I can suggest is try to adapt the methods used here:-
Using phonemes from other languages
and here:-
New Language Cover (Sardinian)
These do not do Vietnamese but do create other languages as you are trying to do.
Maybe Script - To Language Phoneme (Customizable) might also help although it would require some effort for you to set it up for a new language.