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