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, dong doanh
dung toan » dung doanh, dung thang, dung thanh
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) OR (dung toan)) phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - canh tranh ((cua ung) OR (cua nhung)) ((dung doan) OR (dung toan)) 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) OR (dung toan)) phan dau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh tranh ((cua ung) or (cua nhung)) ((dung doan) OR (dung toan)) phan dau*.