Perhaps you should try some spelling variations:
doi chieu » doc hieu, ho chieu, mot chieu
cua dung » cua dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
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 dong)) cong dan toan cao~.
• 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 dong)) cong dan toan cao.
• 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 dong)) cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doi chi)) sach - canh tranh ((cua dung) OR (cua dong)) cong dan toan cao*.