Perhaps you should try some spelling variations:
tien thanh » tien thinh, den thanh
tran thanh » ban thanh, van thanh, quan thanh
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh qua » tranh cua, thanh qua, trinh qua
qua dung » quang dung, su dung, qua song
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: hoc ((tien thanh) OR (tran thanh)) - hanh tranh qua dung ((cong dan) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien thanh) OR (tran thanh)) - hanh tranh qua dung ((cong dan) OR (cong san)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((tien thanh) OR (tran thanh)) - hanh tranh qua dung ((cong dan) or (cong san)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((tien thanh) OR (tran thanh)) - hanh tranh qua dung ((cong dan) or (cong san)) toan cau*.