Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
doi chieu » doc hieu, doi chi, ho chieu
cong dan » cong san, cong tan, huong dan
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap
manh va » anh va, minh va, lanh va
hanh va » hang va, hanh vi

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 xanh - canh ((manh va) OR (hanh va)) nhung ((cong dan) or (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu xanh - canh ((manh va) OR (hanh va)) nhung ((cong dan) OR (cong tac)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu xanh - canh ((manh va) OR (hanh va)) nhung ((cong dan) or (cong tac)) toan cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - canh ((manh va) OR (hanh va)) nhung ((cong dan) or (cong tac)) toan cau*.