Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
truong va » truong dai, truong cao, truong dao
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
trung va » trang va, trung ha, trung tam
cong tan » cong tac, cong san, cong thanh
ran cau » van cau, can cau, tran chau
ban cau » bang cau, ban can, van cau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - thanh ((trung va) OR (truong va)) dung cong tan ((ran cau) OR (ban cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sach - thanh ((trung va) OR (truong va)) dung cong tan ((ran cau) or (ban cau))~".
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - thanh ((trung va) OR (truong va)) dung cong tan ((ran cau) or (ban cau))*.