Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
cong cong » cong dong, trong cong, dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
anh nhan » danh nhan, doanh nhan, thanh nhan
cong tan » cong tac, cong san, cong thanh
tan doan » tran doan, tap doan, van doan
doan cao » doanh cao, toan cao, doan 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 - ((anh nhan) or (anh tuan)) thanh cong cong tan doan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - ((anh nhan) OR (anh tuan)) thanh cong cong tan doan cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - ((anh nhan) or (anh tuan)) thanh cong cong tan doan cao*.