Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien manh » hien hanh, tien manh, hieu manh
tuan dung » tuan duong, tran dung, tuan dang
tan dung » tran dung, tin dung, van dung
cong tac » cong ty
trai cau » tra cau, trai chan, tai cac
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien manh - thanh trung ((tuan dung) or (tan dung)) cong tac ((trai cau) OR (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien manh - thanh trung ((tuan dung) OR (tan dung)) cong tac ((trai cau) OR (toan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien manh - thanh trung ((tuan dung) or (tan dung)) cong tac ((trai cau) OR (toan cau))".
• Adding a wildcard symbol may retrieve word variants: hoc hien manh - thanh trung ((tuan dung) or (tan dung)) cong tac ((trai cau) OR (toan cau))*.