Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
doi chieu » doc hieu, ho chieu, mot chieu
trinh vat » trinh van, trinh luat, sinh vat
vat dang » van dang, vat dung, va dang
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cau » toan cao, toan ban, toan tap
doi chi » doi khi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (doi chi)) xanh - canh trinh vat dang ((cong dan) OR (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) xanh - canh trinh vat dang ((cong dan) OR (cong san)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (doi chi)) xanh - canh trinh vat dang ((cong dan) OR (cong san)) toan cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doi chi)) xanh - canh trinh vat dang ((cong dan) OR (cong san)) toan cau*.