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
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
cong tac » cong ty
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: hoc hieu manh - thanh ((tran tuan) or (quan thanh)) dung cong tac tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - thanh ((tran tuan) OR (quan thanh)) dung cong tac tran cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - thanh ((tran tuan) or (quan thanh)) dung cong tac tran cau*.