Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
hanh tang » hanh trang, anh tang, hanh mang
cua trong » cua truong, cua trung, qua trong
chinh cau » chinh chau, chinh ca, chinh can
doc hieu » toc thieu, hoc thieu, hoc hien
tang cua » mang cua, hang cua, tang luan
cong dan » cong san, cong tan, huong dan
chan cau » phan cau, can cau, nhanh cau

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 - hanh tang cua trong cong dan ((chan cau) or (chinh cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - hanh tang cua trong cong dan ((chan cau) OR (chinh cau)).
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - hanh tang cua trong cong dan ((chan cau) or (chinh cau))*.