Perhaps you should try some spelling variations:
chong cong » cong cong, thong cong, cuong cong
hieu sach » chieu sach, hieu cach, hieu sau
dien sach » dien anh
tranh cua » doanh cua, manh cua
cua chong » cua cong, cua chung, cua khong
dan chinh » dang chinh, lan chinh, van chinh
chinh can » chinh ca, chinh ban, chinh cau
hieu cac » hieu luc, hieu va, hieu van
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 (hieu cac))) or (dien sach)) - canh tranh cua chong cong dan chinh can~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((((hieu sach) OR (hieu cac))) OR (dien sach)) - canh tranh cua chong cong dan chinh can.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((((hieu sach) OR (hieu cac))) or (dien sach)) - canh tranh cua chong cong dan chinh can".
• Adding a wildcard symbol may retrieve word variants: doc ((((hieu sach) OR (hieu cac))) or (dien sach)) - canh tranh cua chong cong dan chinh can*.