Perhaps you should try some spelling variations:
canh thanh » canh tranh, danh thanh, anh thanh
thanh qua » thanh quan, thanh qui, hanh qua
ho chieu » theo chieu, hoc thieu, doi chieu
doc hieu » toc thieu, hoc thieu, hoc hien
qua cong » cua cong, qua song, va cong
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
doan dau » doan dieu, phan dau, doan va

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: ((ho chieu) OR (doc hieu)) xanh - canh thanh qua cong ((cong tan) OR (cong san)) doan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doc hieu)) xanh - canh thanh qua cong ((cong tan) OR (cong san)) doan dau~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doc hieu)) xanh - canh thanh qua cong ((cong tan) OR (cong san)) doan dau*.