Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hanh trang » thanh trung, canh tranh, hanh trinh
trang cua » tranh cua, tang cua, trung cua
cua nhung » va nhung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan ban » van ban

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

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