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