Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doanh khoa » toan khoa
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
cua nhung » va nhung
khoa cua » hoa cua, kho cua, khoe cua
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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 - doanh khoa cua nhung cong ((((dan toan) or (dan than))) or (anh tuan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - doanh khoa cua nhung cong ((((dan toan) OR (dan than))) OR (anh tuan)) cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - doanh khoa cua nhung cong ((((dan toan) or (dan than))) or (anh tuan)) cau*.