Perhaps you should try some spelling variations:
tang luan » dung luan
luan hung » luan chung, lan hung, luan ung
tien anh » tien manh, dien anh, tien thanh
anh tang » anh bang, anh dang, anh nang
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 anh) or (tieng anh)) - anh tang luan hung ((cong dan) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien anh) OR (tieng anh)) - anh tang luan hung ((cong dan) OR (cong san)) toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((tien anh) or (tieng anh)) - anh tang luan hung ((cong dan) or (cong san)) toan cau*.