Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
dung cuong » dung cong, dung luong, dang cuong
doi chieu » doc hieu, doi chi, ho chieu
tung su » dung su, rung su, tang su
ma toan » ma tran, manh toan, bai toan
va toan » van toan, bai toan, tap toan

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 tung su dung cuong ((ma toan) or (va toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh tung su dung cuong ((ma toan) OR (va toan)) cao.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh tung su dung cuong ((ma toan) or (va toan)) cao*.