Perhaps you should try some spelling variations:
dung quang » dang quang, dung quan, luong quang
hieu soat » hieu suat, hieu hoat, hieu luat
luan thoi » luan thi, luan chi, luan khoa
thoi mien » thoi hien, thoi gian, thoi quen
mien soat » kiem soat, bien soan, dien hoat
nam hieu » nam hien, nam chien, cao hieu
tin » tinh

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 quang nam hieu soat ) or ( trinh dung luan thoi mien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung quang nam hieu soat ) OR ( trinh dung luan thoi mien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung quang nam hieu soat ) or ( trinh dung luan thoi mien soat ))*.