Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, huyen tam
quyen cap » quyen cach, huyen cao, quyen con
thai cong » tai cong, thanh cong, thai son
thi cong » tai cong, thien cong
cac thu » cach thuc, cac thoi
ban ke » ban kem, ban ve, ban le
ke y » ke ky, ke o
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: ((quyen tap) OR (quyen cap)) cac thu đe co ban ke y ((thai cong) OR (thi cong)) dong~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((quyen tap) or (quyen cap)) cac thu đe co ban ke y ((thai cong) OR (thi cong)) dong~".
• Adding a wildcard symbol may retrieve word variants: ((quyen tap) or (quyen cap)) cac thu đe co ban ke y ((thai cong) OR (thi cong)) dong*.