Perhaps you should try some spelling variations:
trong van » trong cac
pham duy » pham duc
thanh vi » hanh vi, thanh va, thanh ve
vu khac » vu kham, vu khanh, bui khac
khac ty » khac thi
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duy gia » duy gian, duc gia, quy gia
su viet » so viet
vi su » va su, ve su, ki su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu khac ty ((trong van) or (mang may)) hoi. hieu ve pham duy gia thanh vi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khac ty ((trong van) OR (mang may)) hoi. hieu ve pham duy gia thanh vi su viet.
• Adding a wildcard symbol may retrieve word variants: vu khac ty ((trong van) or (mang may)) hoi. hieu ve pham duy gia thanh vi su viet*.