Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
tranh van » tran van, trinh van, thanh van
van nhung » van nhuong, va nhung, van hung
ho chieu » theo chieu, hoc thieu, mot chieu
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan tap » toan ban

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 (doi chieu)) xanh - canh tranh van nhung ((cong dan) OR (cong san)) toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) xanh - canh tranh van nhung ((cong dan) OR (cong san)) toan tap~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) xanh - canh tranh van nhung ((cong dan) OR (cong san)) toan tap*.