Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
trang cua » tranh cua, tang cua, trung cua
cua nhung » va nhung
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan 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 ((chiet tach) or (chinh sach)) - hanh trang cua nhung cong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chiet tach) OR (chinh sach)) - hanh trang cua nhung cong tan van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chiet tach) or (chinh sach)) - hanh trang cua nhung cong tan van ban*.