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, nguoi san, nguong dan
tac dung » sach dung, xay dung, tin dung
dan than » dan chan, ban than, van than
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 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 than cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh tranh ((tac dung) or (cac duong)) nguoi dan than cau*.