Perhaps you should try some spelling variations:
minh quang » tinh quang, dinh quang, minh hoang
dung quang » dang quang, dung quan, luong quang
hieu soat » hieu suat, hieu hoat, hieu luat
lien soat » kiem soat, bien soan, lien son
quan van » luan van, quan va, quan doan
quang va » quang van, quan va, quang ma
va lien » vat lieu, hai lien

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

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