Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh tranh » canh tranh, hanh trinh, hanh trang
doi chiet » doi chieu, doi chi, doi viet
cua dung » cua dang, cua dong, cua rung
qua dung » quang dung, su dung, qua song
cong tac » cong ty
chay cao » cay cao, chat cao, nha cao

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 chiet tach - hanh tranh ((cua dung) OR (qua dung)) ((cong san) OR (cong tac)) chay cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chiet tach - hanh tranh ((cua dung) OR (qua dung)) ((cong san) or (cong tac)) chay cao~".
• Adding a wildcard symbol may retrieve word variants: doi chiet tach - hanh tranh ((cua dung) OR (qua dung)) ((cong san) or (cong tac)) chay cao*.