Perhaps you should try some spelling variations:
tranh luan » trinh luan, trinh luat, doanh luan
hanh tranh » canh tranh, hanh trinh, hanh trang
luan nhung » luan chung, luan hung, quan nhung
nhung dong » nhung don, nhung cong, nhung dung
dong tinh » dong kinh, dong tin, cong tinh
hoc hieu » hoc thieu, doc hieu, hoc dieu
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hieu) or (hoc hien)) manh - hanh tranh luan nhung dong tinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hieu) OR (hoc hien)) manh - hanh tranh luan nhung dong tinh toan ban.
• Adding a wildcard symbol may retrieve word variants: ((hoc hieu) or (hoc hien)) manh - hanh tranh luan nhung dong tinh toan ban*.