Perhaps you should try some spelling variations:
kinh quan » sinh quan, tinh quan, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
anh quang » anh xquang, anh quan, nhanh quang
van hieu » cao hieu
quang le » quang yen, quan ly, quan li
vat hieu » vat lieu, va hieu, rat nhieu
dat hieu » dao hieu, dat tieu, rat nhieu
luan » lan

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

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