Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu lang » chieu sang, hieu quang, nhieu tang
chinh cau » chinh chau, chinh ca, chinh can
tam tong » tai tong, tam song, tam thuong
tam nong » lam nong, tam duong, tam huong
cong tac » cong ty
chan cau » phan cau, can cau, nhanh cau
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 ((tam tong) OR (tam nong)) cong tac ((chan cau) or (chinh cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh trung ((tam tong) OR (tam nong)) cong tac ((chan cau) OR (chinh cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - thanh trung ((tam tong) OR (tam nong)) cong tac ((chan cau) or (chinh cau))".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh trung ((tam tong) OR (tam nong)) cong tac ((chan cau) or (chinh cau))*.