Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
chinh cua » chinh ca, hinh cua, chinh luan
chinh sua » chinh su, chinh luan, hinh su
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((chinh cua) OR (chinh sua)) nhung cong ((dan toan) OR (van toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh ((chinh cua) OR (chinh sua)) nhung cong ((dan toan) or (van toan)) cao~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ((chinh cua) OR (chinh sua)) nhung cong ((dan toan) or (van toan)) cao*.