Perhaps you should try some spelling variations:
dong thanh » truong thanh
dich phan » duc phan, dien phan, mach phan
bien soan » bien so
hanh dong » anh dong, ha dong
thanh van » thanh san, thanh toan, thanh phan
hieu soat » hieu suat, hieu hoat, hieu luat
quan van » quan va, quan luan, quan doan
van hieu » cao hieu
luan » lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( dich phan ((quan van) OR (luan van)) bien soan ) or ( hanh dong thanh van hieu soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( dich phan ((quan van) OR (luan van)) bien soan ) OR ( hanh dong thanh van hieu soat ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( dich phan ((quan van) OR (luan van)) bien soan ) or ( hanh dong thanh van hieu soat ))*".