Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
chieu sach » chinh sach, chiet tach, chieu sang
manh trung » manh tung, thanh trung, manh hung
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, dieu hanh, hien hanh
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao van

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 (hieu nganh))) or (chieu sach)) - manh trung cua nhung cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((hieu manh) OR (hieu nganh))) OR (chieu sach)) - manh trung cua nhung cong dan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((hieu manh) OR (hieu nganh))) or (chieu sach)) - manh trung cua nhung cong dan van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((((hieu manh) OR (hieu nganh))) or (chieu sach)) - manh trung cua nhung cong dan van ban*.