Perhaps you should try some spelling variations:
thien tinh » khien tinh, thien minh, tien tinh
hien tinh » khien tinh, bien tinh, dien tinh
trinh cua » tinh cua, trinh quan, trinh luan
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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 ((hien tinh) OR (thien tinh)) - hanh ((trinh cua) or (trinh luat)) dung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien tinh) OR (thien tinh)) - hanh ((trinh cua) OR (trinh luat)) dung cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien tinh) OR (thien tinh)) - hanh ((trinh cua) or (trinh luat)) dung cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien tinh) OR (thien tinh)) - hanh ((trinh cua) or (trinh luat)) dung cong dan toan cau*.