Perhaps you should try some spelling variations:
thanh dung » thanh duong, thanh tung, thanh hung
hieu lang » chieu sang, hieu quang, nhieu tang
hoi hieu » hoi phieu, hoi tieu, moi hieu
dong san » dong bang, dong von, dong ha
cong san » cong tac
phan cau » phan dau, phan cac, phan tu
va hang » van hang, va lang, va hanh
va nang » van nang, da nang, cam nang

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - thanh dung ((va hang) OR (va nang)) ((dong san) OR (cong san)) phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi hieu lang - thanh dung ((va hang) OR (va nang)) ((dong san) or (cong san)) phan cau~".
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - thanh dung ((va hang) OR (va nang)) ((dong san) or (cong san)) phan cau*.