Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
dung cong » dung trong
dung xay » dung may, dung tay, dong xay
dang xay » dang van, van xay
ban than » ban thanh, van thanh, ban hang
van tan » van tuan, van ban, van tai

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 - thanh ((dung xay) OR (dang xay)) dung cong ((van tan) or (ban than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh ((dung xay) OR (dang xay)) dung cong ((van tan) OR (ban than)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - thanh ((dung xay) OR (dang xay)) dung cong ((van tan) or (ban than)) cao".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh ((dung xay) OR (dang xay)) dung cong ((van tan) or (ban than)) cao*.