Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
canh trinh » canh tranh, hanh trinh, anh trinh
canh tinh » hanh tinh, manh tinh, canh tranh
toan hang » toan thang, toan hanh, toan mang
hang cong » dang cong, hang nong, bang cong
cong toan » cong tan, cong hoan, cong tuan
toan phan » thanh phan, toan ban, hoa phan
ho chieu » theo chieu, hoc thieu, mot chieu
phan cau » phan dau, phan cac, phan tu

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