Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh tranh » hanh trinh, hanh trang, lanh tranh
nhung dong » nhung don, nhung cong, nhung dung
cua nhung » va nhung
ho chieu » theo chieu, hoc thieu, doi chieu
hoc toan » hoc tan, hoa toan, hoc than
hop toan » hop hoan, phap 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: ho chieu sach - ((hanh tranh) or (canh tranh)) cua nhung dong ((hoc toan) or (hop toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - ((hanh tranh) OR (canh tranh)) cua nhung dong ((hoc toan) OR (hop toan)) cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - ((hanh tranh) or (canh tranh)) cua nhung dong ((hoc toan) or (hop toan)) cau*.