Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
canh tinh » hanh tinh, manh tinh, nhanh tinh
toan hang » toan thang, toan hanh, toan mang
hang cong » dang cong, hang nong, bang cong
ho chieu » theo chieu, hoc thieu, mot chieu
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan lap » phan dau

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 - ((canh tinh) or (canh tranh)) toan hang cong tan phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - ((canh tinh) OR (canh tranh)) toan hang cong tan phan lap.
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - ((canh tinh) or (canh tranh)) toan hang cong tan phan lap*.