Perhaps you should try some spelling variations:
quang quang » quan quang, dang quang, dung quang
cong quang » luong quang, thong quang, duong quang
quang dien » quan dien, luong dien, quan den
dinh cong » dinh cuong, dinh hong, dinh long
dien hoat » dien hoa, dien hat, trien hoat
van hieu » cao hieu
tin » tinh
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: (( tin dung luan van hieu qua ) or ( dinh cong quang quang dien hoat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung luan van hieu qua ) OR ( dinh cong quang quang dien hoat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung luan van hieu qua ) or ( dinh cong quang quang dien hoat ))*.