Original: I love you dad is Toi YEu cha ( If you love very much then say Toi Yeu Cha Lam )
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EDIT: To say "toi" to your own dad is like slapping him in the face. And yeu is to actually show love in the romantic way. So if you're into incest than I suggest you use another word.
The ACTUAL way to say it is "Con thuong bo/ba" [Bo/Ba because depending on which part of Vietnam you're from the people say "dad" differently.
Nice fail translation from Google translate.
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yêu
Em yêu anh (I love you - you wouldn't use the name in vietnamese for this sentance)
i love you
Anh yeu em
Em yeu ong xa!
Ahh Yeu em or Em yeu ahh
cô ấy
For boys: Tôi không yêu em. For girls: Tôi không yêu anh.
it's vietnamese and you say chao like chow but slower
how to say OK in vietnamese
You would say "Em yêu anh" and yes, gay love is taboo in Vietnam, however, it is not illegal.
Dad in Vietnamese is ba Mom in Vietnamese is me