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 kiet » luan ket, xuan viet, quan viet
kiet soat » kiem soat, kiem sat, kiet xuat
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 kiet 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 kiet soat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung luan van hieu soat ) or ( tin dung quang tuan kiet soat ))*.