Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
khong cong » thong cong, khong cang, chong cong
doi chieu » doc hieu, doi chi, ho chieu
tranh cua » doanh cua, manh cua
cua khong » hua khong, cua phuong, cua thuong
van toan » van tuan, van tan, van thanh
bai toan » bai tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - canh tranh cua khong cong ((van toan) or (bai toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - canh tranh cua khong cong ((van toan) OR (bai toan)) ban*.