Perhaps you should try some spelling variations:
quang tuan » quang thanh, quan luan, quang cua
dung quang » dang quang, dung quan, luong quang
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
tuan kien » tuan kiet, tuan tien, xuan kien
kien soat » kiem soat, bien soan, kien hoa
van hieu » cao hieu
luan » quan, 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 dung quang tuan kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van hieu soat ) OR ( tinh dung quang tuan kien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu soat ) or ( tinh dung quang tuan kien soat ))*.