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