Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tran » hanh trang, thanh tran, hanh tram
van phong » van dong, hai phong
thanh cao » thanh ca, thanh thao, thanh cham
thanh cac » hanh cac, thanh bac, thanh ca
hoi hieu » hoi phieu, hoi tieu, moi hieu
van dung » van dong, xay dung, tin dung
cong tai » cong thai, cong tac, dong tai

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 - hanh tran ((van dung) OR (van phong)) cong tai ((thanh cao) OR (thanh cac))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi hieu lang - hanh tran ((van dung) or (van phong)) cong tai ((thanh cao) OR (thanh cac))~".
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - hanh tran ((van dung) or (van phong)) cong tai ((thanh cao) OR (thanh cac))*.