Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
tinh quan » tinh quang, tin quan, sinh quan
van hieu » cao hieu
quan van » quan va, quan luan, quan doan
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: (( tinh dung luan van hieu soat ) or ( ((tinh quan) or (trinh quan)) quan van hieu soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van hieu soat ) OR ( ((tinh quan) OR (trinh quan)) quan van hieu soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu soat ) or ( ((tinh quan) or (trinh quan)) quan van hieu soat ))*.