Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu manh » chieu xanh, hieu nganh, dieu hanh
hien hanh » dieu hanh
tuan dung » tuan duong, tran dung, tuan dang
tan dung » tran dung, tin dung, van dung
cong tac » cong ty
tac trai » tam trai, khac trai, rac thai
trai cau » tra cau, trai chan, toan 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) or (hien hanh)) - thanh trung ((tuan dung) or (tan dung)) cong tac trai cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hien hanh)) - thanh trung ((tuan dung) OR (tan dung)) cong tac trai cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hien hanh)) - thanh trung ((tuan dung) or (tan dung)) cong tac trai cau*.