Perhaps you should try some spelling variations:
quang qluan » quan luan, quang tuan, quang uan
trinh quang » tinh quang, trinh quan, tranh quang
quang luan » quan luan, quang tuan, quang uan
dinh quang » tinh quang, minh quang, dinh duong
hieu soat » hieu suat, hieu hoat, hieu luat
qluan van » quan van, luan va, quan va
kien soat » bien soan, kien hoa, dien hoat
kiem soat » kiem toan
van hieu » cao hieu

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

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