Perhaps you should try some spelling variations:
quang kinh » quang ninh, quang minh, quang vinh
quang binh » quang ninh
hieu soat » hieu suat, hieu hoat, hieu luat
tinh dang » tinh dung, binh dang, tinh sang
hien soat » thien hoat, kiem soat, bien soan
van hieu » cao hieu
luan » quan, lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( trinh dung luan van hieu soat ) or ( tinh dang ((quang kinh) OR (quang binh)) hien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung luan van hieu soat ) OR ( tinh dang ((quang kinh) OR (quang binh)) hien soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( trinh dung luan van hieu soat ) or ( tinh dang ((quang kinh) OR (quang binh)) hien soat ))".
• Adding a wildcard symbol may retrieve word variants: (( trinh dung luan van hieu soat ) or ( tinh dang ((quang kinh) OR (quang binh)) hien soat ))*.