Perhaps you should try some spelling variations:
trien minh » trien kinh, tien minh, trieu minh
luan nhung » luan chung, luan hung, quan nhung
tien tinh » tien thinh, tien trinh, thien tinh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
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 (trien minh)) - hanh tang luan nhung ((cong san) or (huong dan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien tinh) OR (trien minh)) - hanh tang luan nhung ((cong san) OR (huong dan)) toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((tien tinh) or (trien minh)) - hanh tang luan nhung ((cong san) or (huong dan)) toan cao*.