Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, ho chieu
mot chieu » ho chieu
trong cua » truong cua, thong cua, trong ca
cua dung » cua dang, cua dong, qua dung
cua toan » cuu toan, xuan toan, cua thanh
toan cao » toan ban, toan tap
ha dong » hoat dong, van dong

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (mot chieu)) sach - canh tranh ((cua dung) OR (ha dong)) trong cua toan cao~.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (mot chieu)) sach - canh tranh ((cua dung) or (ha dong)) trong cua toan cao*.