Perhaps you should try some spelling variations:
dinh quang » tinh quang, minh quang, dinh duong
quang tung » quang trung, quang dung, quang hung
hieu soat » hieu suat, hieu hoat, hieu luat
kien soat » kiem soat, bien soan, kien hoa
tung van » trung van, tang van, dung van
van hieu » cao hieu
van kien » van tien, van hien, van chien
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: (( dinh quang tung van hieu soat ) or ( tin dung luan van kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( dinh quang tung van hieu soat ) OR ( tin dung luan van kien soat )).
• Adding a wildcard symbol may retrieve word variants: (( dinh quang tung van hieu soat ) or ( tin dung luan van kien soat ))*.