Perhaps you should try some spelling variations:
tranh luan » trinh luan, trinh luat, doanh luan
luan chung » luan chinh
chung cong » nhung cong, chong cong, phung cong
khi hanh » thi hanh, chi hanh, chi nhanh
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
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: doi khi hanh - canh tranh luan chung cong tap toan cau~.
• Adding a wildcard symbol may retrieve word variants: doi khi hanh - canh tranh luan chung cong tap toan cau*.