Perhaps you should try some spelling variations:
quang qluan » quan luan, quang tuan, quang uan
trinh quan » trinh luat, trinh han
dinh quang » minh quang, dinh duong, dinh huong
hieu soat » hieu suat, hieu hoat, hieu luat
qluan van » quan van, luan va, quan va
kien soat » kiem soat, bien soan, kien hoa
van hieu » cao hieu
van kien » van tien, van hien, van chien

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

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