Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trinh » canh tranh, hanh chinh
trinh su » trinh tu, trinh san, trinh cau
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
van cau » van dau, van hau, van chat

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 xanh - hanh trinh su dung ((cong dan) OR (cong san)) ((van cau) OR (phan tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu xanh - hanh trinh su dung ((cong dan) OR (cong san)) ((van cau) or (phan tu))~".
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - hanh trinh su dung ((cong dan) OR (cong san)) ((van cau) or (phan tu))*.