Perhaps you should try some spelling variations:
quang tran » quang tuan, quang trung, quang thanh
thien hoat » trien hoat, thien thuat, tien hoa
dung quan » dung quang, dung luan, luong quan
hieu soat » hieu suat, hieu hoat, hieu luat
hien soat » kiem soat, bien soan, hien luat
tran van » luan van
quan vi » quan li, quan tri, quan doi
vi hieu » vi dieu, va hieu, vo hieu

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