Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
trang va » tran van, hang va
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan cau » toan cao, toan tap, toan tai
toan ban » van 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: doc hieu xanh - hanh trang va nhung ((cong tan) OR (cong tac)) ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh trang va nhung ((cong tan) OR (cong tac)) ((toan cau) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh trang va nhung ((cong tan) OR (cong tac)) ((toan cau) or (toan ban))*.