Perhaps you should try some spelling variations:
quang luan » quan luan, quang tuan, quang uan
dinh quang » minh quang, dinh huong, dinh xuan
kiem soat » kiem toan
hieu soat » hieu suat, hieu hoat, hieu luat
van kiem » va kiem, van kien, van hien
van hieu » cao hieu
tinh » trinh, minh, kinh

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quang luan van kiem soat ) OR ( ((dinh quang) OR (dinh duong)) luan van hieu soat ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh quang luan van kiem soat ) or ( ((dinh quang) OR (dinh duong)) luan van hieu soat ))~".
• Adding a wildcard symbol may retrieve word variants: (( tinh quang luan van kiem soat ) or ( ((dinh quang) OR (dinh duong)) luan van hieu soat ))*.