Perhaps you should try some spelling variations:
viet tran » viet trang, viet tuan, viet trung
nhung tri » nhung bai, dung tri, nhung bi
tran cong » tran hong, trien cong, tran hoang
cong tac » cong ty
tac tran » tan tran, tac trai, tac tren
que van » qua van, quyet van, quan van
quy van » duy van, qua van, quyet van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: nhung tri ((que van) OR (quy van)). viet tran cong tac tran~.
• Adding a wildcard symbol may retrieve word variants: nhung tri ((que van) or (quy van)). viet tran cong tac tran*.