Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
tong cong » trong cong, cong cong, dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
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 - thanh ((trung cua) or (trung cap)) tong cong dan than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - thanh ((trung cua) OR (trung cap)) tong cong dan than cap.
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - thanh ((trung cua) or (trung cap)) tong cong dan than cap*.