Perhaps you should try some spelling variations:
quang quan » quang tuan, quang uan, quan quan
duong luan » dung luan, dong luan, duong quan
thien hoat » trien hoat, thien thuat, tien hoa
hieu soat » hieu suat, hieu hoat, hieu luat
kiem soat » kiem toan
quan ha » quan he
ha hieu » nha hieu, va hieu, phan hieu
tinh » trinh, minh, kinh

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 ha hieu soat ) or ( dinh duong luan van ((thien hoat) or (kiem soat)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quang quan ha hieu soat ) OR ( dinh duong luan van ((thien hoat) OR (kiem soat)) )).
• Adding a wildcard symbol may retrieve word variants: (( tinh quang quan ha hieu soat ) or ( dinh duong luan van ((thien hoat) or (kiem soat)) ))*.