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
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cua dung » cua dang, cua dong, qua dung
cong dan » cong san, cong tan, huong dan
than cao » toan cao, thai cao, than sao
than cap » khan cap, thanh lap, thanh cac

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 dung cong dan ((than cao) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - manh trung cua dung cong dan ((than cao) OR (than cap)).
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - manh trung cua dung cong dan ((than cao) or (than cap))*.