Perhaps you should try some spelling variations:
thien tinh » thien minh, tien tinh, trien tinh
khien tinh » khien thich, bien tinh, dien tinh
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh va » tranh van, trang va, trinh va
cong san » cong tac
cong tan » cong tac, cong thanh, cong ty
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 ((thien tinh) OR (khien tinh)) - hanh tranh va nhung ((cong san) or (cong tan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien tinh) OR (khien tinh)) - hanh tranh va nhung ((cong san) OR (cong tan)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien tinh) OR (khien tinh)) - hanh tranh va nhung ((cong san) or (cong tan)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien tinh) OR (khien tinh)) - hanh tranh va nhung ((cong san) or (cong tan)) toan cau*.