Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trong mach » trong cac, trong minh, trong anh
doi chieu » doc hieu, doi chi, ho chieu
mach toan » manh toan, hach toan, mach tuan
cua dong » chua dong, cua cong, cua nong
cua dang » cua cong, cua ban
toan cau » toan cao, toan ban, toan tap

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 cong ((cua dong) or (cua dang)) trong mach toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh cong ((cua dong) OR (cua dang)) trong mach toan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh cong ((cua dong) or (cua dang)) trong mach toan cau*.