Perhaps you should try some spelling variations:
chong cong » cong cong, thong cong, cuong cong
hieu sach » chieu sach, hieu cach, hieu cac
dien sach » dien anh
canh manh » lanh manh, canh tranh, cach mang
cua chong » cua cong, cua chung, cua khong
chinh can » chinh ca, chinh cau, chinh ngan
chinh ban » chinh bao, chinh ngan, chinh luan
manh cua » doanh cua, ban cua
cong dan » cong san, cong tan, huong dan

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) or (dien sach)) - canh manh cua chong cong dan ((chinh can) or (chinh ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sach) OR (dien sach)) - canh manh cua chong cong dan ((chinh can) OR (chinh ban)).
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) or (dien sach)) - canh manh cua chong cong dan ((chinh can) or (chinh ban))*.