Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
tranh cua » doanh cua, manh cua
cua chong » cua cong, cua chung, cua khong
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
chinh ca » chinh ta, chinh va, chinh tai

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 - canh tranh cua chong ((cong dan) OR (cong san)) chinh ca~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sach - canh tranh cua chong ((cong dan) OR (cong san)) chinh ca".
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - canh tranh cua chong ((cong dan) OR (cong san)) chinh ca*.