Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh tranh » canh tranh, hanh trinh, hanh trang
duong tap » duong tai, duong tam, cuong tap
ho chieu » theo chieu, hoc thieu, doi chieu
cua dang » cua cong, cua ban
cua dong » chua dong, cua cong, cua nong
tap toan » tap doan, tap quan, bai toan
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: ho chieu sach - hanh tranh ((cua dang) or (cua dong)) duong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh tranh ((cua dang) OR (cua dong)) duong tap toan cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh tranh ((cua dang) or (cua dong)) duong tap toan cau*.