Perhaps you should try some spelling variations:
thien tinh » thien minh, tien tinh, trien tinh
khien tinh » khien thich, bien tinh, dien tinh
hanh trinh » canh tranh, hanh chinh
dung cong » dung trong
trinh te » trinh tu, trinh he, trinh ke
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap
te dung » tieu dung, tien dung, tin dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien tinh) or (khien tinh)) - hanh trinh te dung cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien tinh) OR (khien tinh)) - hanh trinh te dung cong san toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien tinh) or (khien tinh)) - hanh trinh te dung cong san toan cau*.