Perhaps you should try some spelling variations:
hanh tranh » hanh trinh, hanh trang, lanh tranh
doi chieu » doi chi, ho chieu, mot chieu
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cua dung » cua dang, cua dong, qua dung
cong san » cong tac
san chay » san pham, van chat, dan chan
chay cao » cay cao, chat cao, nha cao

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 - ((hanh tranh) OR (canh tranh)) cua dung cong san chay cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - ((hanh tranh) OR (canh tranh)) cua dung cong san chay cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (doc hieu)) sach - ((hanh tranh) OR (canh tranh)) cua dung cong san chay cao".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doc hieu)) sach - ((hanh tranh) OR (canh tranh)) cua dung cong san chay cao*.