Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » hanh chinh
chua xang » chua nang, chuc nang, chu bang
xang cong » dang cong, bang cong, hang cong
ban thanh » ban hanh, ban hang
dan than » dan chan, ban than, van than

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: theo chieu sach - ((hanh trinh) OR (canh tranh)) chua xang cong ((dan than) OR (ban thanh)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - ((hanh trinh) OR (canh tranh)) chua xang cong ((dan than) or (ban thanh)) cau~".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ((hanh trinh) OR (canh tranh)) chua xang cong ((dan than) or (ban thanh)) cau*.