Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
hanh tranh » canh tranh, hanh trinh, hanh trang
mot chieu » doi chieu, ho chieu
tranh qua » tranh cua, thanh qua, trinh qua
trong tan » trong quan, trong cac, trong ca
qua dung » quang dung, su dung, qua song
tan van » tran van, tang van, luan van

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: ((mot chieu) OR (theo chieu)) sach - hanh tranh qua dung trong tan van ban~.
• Adding a wildcard symbol may retrieve word variants: ((mot chieu) or (theo chieu)) sach - hanh tranh qua dung trong tan van ban*.