Perhaps you should try some spelling variations:
tranh hoat » trang hoat, thanh hoa, trinh hoa
cung thang » cang thang, hung thang, dung thang
doi chieu » doc hieu, doi chi, mot chieu
dong cung » dong chung, dong hung, dong cong
ho chieu » theo chieu, hoc thieu, mot chieu
ban can » ban dan, ban hang, ban hanh
van cau » van dau, van hau, van chat

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) or (doi chieu)) sach - canh tranh hoat dong cung thang ((ban can) or (van cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) sach - canh tranh hoat dong cung thang ((ban can) OR (van cau)).
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) sach - canh tranh hoat dong cung thang ((ban can) or (van cau))*.