How to translate a vietnamese name into chinese, and vice versa?

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Try

http://www.multilang.space/ if you do not need super-profi translation in the beginning.

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use TU　ＤＩＥＮ　ＨＡＮ　ＶＩＥＴ　：）

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If the name has a meaning , than you could choose similar meaning chinese words to replace that. If not , or it is too hard to translate, than just like Mayalnchina said, by the pronounciation. 
Here is a more easier way, just say the name to a chinese , let him repeat that , so you will know how that could be in chinese.

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Normally, we just use the similar pronouncation. For example: 胡志明(Hu2 Zhi4 Ming2) ==Hồ Chí Minh    it is the same vice versa

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Vietnam  越南  “yue nan" ,
vice , as noun means（1） "crime ,evil ,immoral" ,罪恶，不道德的行为 （2）mean  恶劣的， wicked   非常坏的，险恶的,villainous罪恶的，卑鄙可耻的
as  "prep" means  replace; subtitute for ; 代替，接替

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