Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
cua nhung » va nhung
dung doan » dung doanh, dung dan, dung toan
doan phan » doanh phan, toan phan, dan phan
phan dau » phan tu, hang dau
cua ung » cua rung, cua ong, cua chung

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 ung) OR (cua nhung)) dung doan phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - canh tranh ((cua ung) OR (cua nhung)) dung doan phan dau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh tranh ((cua ung) OR (cua nhung)) dung doan phan dau*.