Perhaps you should try some spelling variations:
thanh trung » thanh tung
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
cong tan » cong tac, cong thanh, cong ty
than cap » khan cap, thanh lap, thanh cac
phan cau » phan dau, phan cac, phan tu

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