Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
ho chieu » theo chieu, hoc thieu, mot chieu
tranh va » tranh van, trang va, trinh va
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cau » toan cao, toan ban, toan tap
va dang » van dang, va nang, va lang

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