Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
thanh dong » thanh duong, thanh cong, hanh dong
dong thanh » truong thanh
thanh dung » thanh duong, thanh tung, thanh hung
thanh cham » thanh pham, hanh cham, thanh chau
hieu lang » chieu sang, nhieu tang, hieu van
dung cong » dung trong
thanh cha » thanh ha, thanh nha, thanh phan
cong tan » cong tac, cong san, cong thanh

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) or (hieu quang)) - thanh dong thanh dung cong tan ((thanh cham) or (thanh cha))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - thanh dong thanh dung cong tan ((thanh cham) OR (thanh cha)).
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (hieu quang)) - thanh dong thanh dung cong tan ((thanh cham) or (thanh cha))*.