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 dao » nguoi tay
cac dung » cach dung, tac dung, cac dang
dao than » dao thanh, dan than, dao thai
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 ((cac dung) or (cac duong)) nguoi dao than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - canh tranh ((cac dung) OR (cac duong)) nguoi dao than cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh tranh ((cac dung) or (cac duong)) nguoi dao than cau*.