Perhaps you should try some spelling variations:
manh trung » manh tung, thanh trung, manh hung
hieu sach » chieu sach, hieu cach, dien sach
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
than cao » toan cao, thai cao, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sach - manh trung cua nhung ((cong san) or (huong dan)) than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - manh trung cua nhung ((cong san) OR (huong dan)) than cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - manh trung cua nhung ((cong san) or (huong dan)) than cao*.