Perhaps you should try some spelling variations:
chiet tach » chieu sach
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » doanh cua, manh cua
cua nhung » va nhung
thanh van » thanh san, thanh toan, thanh phan
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (chiet tach)) - canh tranh cua nhung ((cong dan) or (cong tan)) thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chiet tach)) - canh tranh cua nhung ((cong dan) OR (cong tan)) thanh van.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (chiet tach)) - canh tranh cua nhung ((cong dan) or (cong tan)) thanh van*.