Perhaps you should try some spelling variations:
chong cong » cong cong, thong cong, cuong cong
hieu sach » chieu sach, hieu cach, dien sach
tranh cua » doanh cua, manh cua
cua chong » cua cong, cua chung, cua khong
van chinh » va chinh, van thinh, hanh chinh
lan chinh » luan chinh, hanh chinh, hoan chinh
doc hieu » toc thieu, hoc thieu, hoc hien

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