Perhaps you should try some spelling variations:
doi chieu » doi chi, ho chieu, mot chieu
tranh huy » thanh huy, trang huy, tranh chua
dong cang » dong cong, dong cung, dong nang
dong bang » dong san
thang ban » hang ban, tang ban, thanh ban
doc hieu » toc thieu, hoc thieu, hoc hien
ban cau » bang cau, ban can, van cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) OR (doc hieu)) sach - canh tranh huy ((dong cang) or (dong bang)) thang ban cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - canh tranh huy ((dong cang) OR (dong bang)) thang ban cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doc hieu)) sach - canh tranh huy ((dong cang) or (dong bang)) thang ban cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doc hieu)) sach - canh tranh huy ((dong cang) or (dong bang)) thang ban cau*.