Perhaps you should try some spelling variations:
dung quang » dang quang, dung quan, luong quang
hieu soat » hieu suat, hieu luat, kiem soat
hieu hoat » hieu hoa, thien hoat, hieu luat
quang cua » quan cua, quang tuan, quang huy
kien soat » kiem soat, bien soan, kien hoa
cua kien » cua bien, cua vien, cuu kien
luan » quan, lan

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 (hieu hoat)) ) or ( tin dung quang cua kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung luan van ((hieu soat) OR (hieu hoat)) ) OR ( tin dung quang cua kien soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tin dung luan van ((hieu soat) OR (hieu hoat)) ) or ( tin dung quang cua kien soat ))".
• Adding a wildcard symbol may retrieve word variants: (( tin dung luan van ((hieu soat) OR (hieu hoat)) ) or ( tin dung quang cua kien soat ))*.