Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu lang » chieu sang, hieu quang, nhieu tang
hoc dang » hoc dung, hoc bang, hoc tang
cong tac » cong ty
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - thanh trung ((hoc dang) or (hoc dan)) cong tac ((than cau) OR (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh trung ((hoc dang) OR (hoc dan)) cong tac ((than cau) OR (than cap))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - thanh trung ((hoc dang) or (hoc dan)) cong tac ((than cau) OR (than cap))*".