Perhaps you should try some spelling variations:
luan nhung » luan chung, luan hung, quan nhung
tien tinh » tien thinh, tien trinh, thien tinh
lien minh » le minh, bien tinh, dien hinh
tang luan » dung luan
anh tang » anh bang, anh dang, anh nang
cong san » cong tac
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 tinh) OR (lien minh)) - anh tang luan nhung ((cong san) OR (huong dan)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((tien tinh) OR (lien minh)) - anh tang luan nhung ((cong san) OR (huong dan)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((tien tinh) OR (lien minh)) - anh tang luan nhung ((cong san) OR (huong dan)) toan cao*.