Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
chieu sach » chinh sach, chiet tach, chieu sang
lanh tranh » lan tranh, hanh trinh, sach tranh
doi chieu » doc hieu, doi chi, ho chieu
va phuong » va thuong, cac phuong
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

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 - ((lanh tranh) or (canh tranh)) va phuong cong ((dan toan) OR (van toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((lanh tranh) OR (canh tranh)) va phuong cong ((dan toan) OR (van toan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((lanh tranh) or (canh tranh)) va phuong cong ((dan toan) OR (van toan)) ban".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((lanh tranh) or (canh tranh)) va phuong cong ((dan toan) OR (van toan)) ban*.