Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
cua dung » cua dang, cua dong, cua rung
qua dung » quang dung, su dung, qua song
cong tac » cong ty
tac hang » tac vang, bac thang, tac chong
hang dau » hang va, hang tai

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 dung) or (qua dung)) cong tac hang dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - canh tranh ((cua dung) OR (qua dung)) cong tac hang dau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh tranh ((cua dung) or (qua dung)) cong tac hang dau*.