Perhaps you should try some spelling variations:
quang quan » quang tuan, quang uan, quan quan
thien hoat » trien hoat, thien thuat, tien hoa
tinh dung » trinh dung, tin dung, tinh huong
kiem soat » kiem toan
hieu hoat » hieu hoa, hieu luat, hieu suat
dung lan » dung luan, dung land, dung lam
van kiem » va kiem, van kien, van hieu
lan van » luan van, lang van, tan van
quan li » quan ly, quan tri

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 dung lan van kiem soat ) OR ( tinh quang quan li ((hieu hoat) OR (thien hoat)) ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung lan van kiem soat ) or ( tinh quang quan li ((hieu hoat) OR (thien hoat)) ))~".
• Adding a wildcard symbol may retrieve word variants: (( tinh dung lan van kiem soat ) or ( tinh quang quan li ((hieu hoat) OR (thien hoat)) ))*.