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