I'll try

Hello,

   I'm not a language specialist, but I know a little about 
name's meaning, so I thougt I'll try. Do Tri Hung: 
Do, last name: has no real meaning.
tri: middle name, means mind, in Vietnamese, it should has a accent aigu "'"
     on top of letter "i". Tri could be spirit too, it depends.
Hung: has 2 cases. If there is "?" on letter "u", then Hung
      means good, becomes good, better, bright...
      If there is an accent grave "`" on top letter u, then
      it means strong, grave, respected.

  The whole names could be a guy with a strong, good mind.
That's what mostly parents want their kid have.
Hope I don't dissapoint you.
                                             Sincerely,
                                               tuan