Perhaps you should try some spelling variations:
thieu quang » thien quan, trien quang, hieu quan
thanh trung » thanh tung
hieu quang » hieu quan, hieu qua, diep quang
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

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) OR (thieu 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) OR (thieu quang)) - thanh trung tam tong cong tac ((chan cau) OR (chinh can)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu quang) OR (thieu quang)) - thanh trung tam tong cong tac ((chan cau) or (chinh can))".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quang) OR (thieu quang)) - thanh trung tam tong cong tac ((chan cau) or (chinh can))*.