Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trinh » canh tranh, hanh chinh
trinh van » trinh han, trinh quan, trinh toan
van hoang » van hoan, quan hoang, tran hoang
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu xanh) or (trieu tinh)) - hanh trinh van hoang ((cong dan) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu xanh) OR (trieu tinh)) - hanh trinh van hoang ((cong dan) OR (cong san)) toan cau.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (trieu tinh)) - hanh trinh van hoang ((cong dan) or (cong san)) toan cau*.