Perhaps you should try some spelling variations:
quang luan » quan luan, quang tuan, quang uan
dung qluan » dung luan, dung quan, dung quang
qluan van » quan van, luan va, quan va
hieu soat » hieu suat, hieu hoat, hieu luat
kien soat » kiem soat, kien hoa, dien hoat
bien soan » bien so
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: (( tin dung qluan van hieu soat ) or ( tinh quang luan van ((kien soat) or (bien soan)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung qluan van hieu soat ) OR ( tinh quang luan van ((kien soat) OR (bien soan)) )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung qluan van hieu soat ) or ( tinh quang luan van ((kien soat) or (bien soan)) ))*.