Perhaps you should try some spelling variations:
quang tuan » quang thanh, quan luan, quang cua
dinh quang » minh quang, dinh duong, dinh huong
kiem soat » kiem toan
hieu soat » hieu hoat, hieu luat, hieu so
hieu suat » hieu luat, hieu qua
tuan van » luan van, tran van, tan van
van kiem » va kiem, van kien, van 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 tuan van kiem soat ) OR ( dinh quang tuan van ((hieu soat) OR (hieu suat)) ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh quang tuan van kiem soat ) or ( dinh quang tuan van ((hieu soat) OR (hieu suat)) ))~".
• Adding a wildcard symbol may retrieve word variants: (( tinh quang tuan van kiem soat ) or ( dinh quang tuan van ((hieu soat) OR (hieu suat)) ))*.