Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
doc hieu » toc thieu, hoc thieu, hoc hien
mang cua » manh cua, dung cua, ban cua
cua dong » chua dong, cua cong, cua dang
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
phan tap » phan lap, han tap, pha tap

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 - cach mang cua dong ((cong dan) or (cong san)) phan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - cach mang cua dong ((cong dan) OR (cong san)) phan tap.
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - cach mang cua dong ((cong dan) or (cong san)) phan tap*.