Perhaps you should try some spelling variations:
chiet tach » chieu sach
hieu nganh » vien nganh, hiem ngan, hieu manh
manh trung » manh tung, thanh trung, manh hung
nhung cong » dung cong, thong cong, hang cong
hien hanh » dieu 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 ((((hien hanh) or (hieu nganh))) or (chiet tach)) - manh trung cua nhung cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((hien hanh) OR (hieu nganh))) OR (chiet tach)) - manh trung cua nhung cong dan van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((((hien hanh) or (hieu nganh))) or (chiet tach)) - manh trung cua nhung cong dan van ban*.