Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
cac duong » cau duong, cac tuong, cac dong
nguoi dan » nguoi dao, nguong dan, nguoi tay
nguoi san » nguoi tay, nguoi dao, nguoi ma
tac dung » sach dung, xay dung, tin dung
than cau » toan cau, phan cau, than cap

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 ((tac dung) or (cac duong)) ((nguoi dan) OR (nguoi san)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - canh tranh ((tac dung) OR (cac duong)) ((nguoi dan) OR (nguoi san)) than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - canh tranh ((tac dung) or (cac duong)) ((nguoi dan) OR (nguoi san)) than cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh tranh ((tac dung) or (cac duong)) ((nguoi dan) OR (nguoi san)) than cau*.