Perhaps you should try some spelling variations:
tranh luan » trinh luan, trinh luat, doanh luan
chinh cong » thanh cong, trinh cong
hieu lang » chieu sang, hieu quang, nhieu tang
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
doc hieu » toc thieu, hoc thieu, hoc hien
tra luan » tra quan, tran xuan, tran tuan
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: doc hieu lang - thanh ((tra luan) or (tranh luan)) chinh cong manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - thanh ((tra luan) OR (tranh luan)) chinh cong manh toan ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - thanh ((tra luan) or (tranh luan)) chinh cong manh toan ban*.