Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
canh trinh » canh tranh, hanh trinh, canh tinh
doi chieu » doc hieu, doi chi, ho chieu
quan dung » quang dung, quan duong, quan dong
cong luan » tong luan, cong tuan, cong luong
dong luan » dung luan, tong luan, dong xuan
qua dung » quang dung, su dung, qua song

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 trinh ((quan dung) OR (qua dung)) ((cong luan) or (dong luan)) phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - canh trinh ((quan dung) OR (qua dung)) ((cong luan) OR (dong luan)) phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - canh trinh ((quan dung) OR (qua dung)) ((cong luan) or (dong luan)) phan tu".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh trinh ((quan dung) OR (qua dung)) ((cong luan) or (dong luan)) phan tu*.