Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu quang » thieu quang, hieu quan, hieu qua
tong cong » trong cong, cong cong, dung cong
chinh can » chinh ca, chinh ban, chinh cau
tam tong » tai tong, tam nong, tam song
cong tac » cong ty
chan cau » phan cau, can cau, chinh 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 quang - thanh trung tam tong cong tac ((chan cau) or (chinh can))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quang - thanh trung tam tong cong tac ((chan cau) OR (chinh can)).
• Adding a wildcard symbol may retrieve word variants: ho hieu quang - thanh trung tam tong cong tac ((chan cau) or (chinh can))*.