Perhaps you should try some spelling variations:
luan nhung » luan chung, luan hung, quan nhung
tien thanh » tien thinh, tran thanh, den thanh
tang luan » dung luan
dien anh » tieng anh, dien dan
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 thanh) or (dien anh)) - anh tang luan nhung ((cong dan) OR (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien thanh) OR (dien anh)) - anh tang luan nhung ((cong dan) OR (cong san)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((tien thanh) or (dien anh)) - anh tang luan nhung ((cong dan) OR (cong san)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((tien thanh) or (dien anh)) - anh tang luan nhung ((cong dan) OR (cong san)) toan cau*.