Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
doc hieu » toc thieu, hoc thieu, hoc hien
canh anh » anh anh, canh tranh, thanh anh
cong dan » cong san, huong dan, cong dong
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap
anh va » hanh va

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu nganh - canh anh va nhung ((((cong dan) OR (cong tan))) or (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - canh anh va nhung ((((cong dan) OR (cong tan))) OR (cong tac)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu nganh - canh anh va nhung ((((cong dan) OR (cong tan))) or (cong tac)) toan cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu nganh - canh anh va nhung ((((cong dan) OR (cong tan))) or (cong tac)) toan cau*.