Perhaps you should try some spelling variations:
quan thanh » ban thanh, van thanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
tran tuan » tran xuan, tran quang, tran thanh
trong tac » trong cac, tuong tac, trong tan
doc hieu » toc thieu, hoc thieu, hoc hien
tac tran » tan tran, tac trai, tac tren
tran cau » tran chau, toan cau, ran cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu manh - thanh ((tran tuan) or (quan thanh)) dung trong tac tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - thanh ((tran tuan) OR (quan thanh)) dung trong tac tran cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - thanh ((tran tuan) or (quan thanh)) dung trong tac tran cau*.