Perhaps you should try some spelling variations:
khuyen cao » huyen cao, nguyen cao, chuyen lao
cac chien » cuoc chien, van chien, nam chien
thai cong » tai cong, thanh cong, thai son
cac khoi » cac thoi, cac khoan, cach thoi
thi cong » tai cong, thien cong
ban ve » ban va
ve y » ve ky, ve _, ke y
dong » dung

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: khuyen cao ((cac khoi) OR (cac chien)) đe co ban ve y ((thai cong) OR (thi cong)) dong~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "khuyen cao ((cac khoi) or (cac chien)) đe co ban ve y ((thai cong) OR (thi cong)) dong~".
• Adding a wildcard symbol may retrieve word variants: khuyen cao ((cac khoi) or (cac chien)) đe co ban ve y ((thai cong) OR (thi cong)) dong*.