Perhaps you should try some spelling variations:
quang quan » quang tuan, quang uan, quan quan
kiem soat » kiem toan
bien soan » bien so
van bien » van tien, van hien, vat bien
quan va » quan vi, quan ha, luan va
va kiem » van kien
tinh » dinh, minh, kinh
luan » lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh quang quan va kiem soat ) or ( trinh dung luan van bien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quang quan va kiem soat ) OR ( trinh dung luan van bien soan ))*.