Perhaps you should try some spelling variations:
quang luan » quan luan, quang tuan, quang uan
quan quang » qua quang, quan quan, quat quang
trien hoat » tien hoa
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
binh quan » binh quang, binh luan, sinh quan
van hieu » cao hieu

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 ( binh quan quang luan ((kiem tra) or (trien hoat)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van hieu soat ) OR ( binh quan quang luan ((kiem tra) OR (trien hoat)) )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu soat ) or ( binh quan quang luan ((kiem tra) or (trien hoat)) ))*.