Perhaps you should try some spelling variations:
doi chieu » doc hieu, ho chieu, mot chieu
cua dung » cua dong, qua dung, cua rung
cua dang » cua cong, cua ban
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban
doi chi » doi khi

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