Perhaps you should try some spelling variations:
thanh duong » thanh huong, thanh cuong, thanh vuong
duong thanh » dong thanh, muong thanh, luong thanh
hieu quang » thieu quang, hieu quan, hieu qua
thanh dung » thanh tung, thanh hung, hanh dung
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 duong 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 duong thanh dung cong tan ((thanh cham) OR (thanh cha)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (hieu quang)) - thanh duong thanh dung cong tan ((thanh cham) or (thanh cha))".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (hieu quang)) - thanh duong thanh dung cong tan ((thanh cham) or (thanh cha))*.