Perhaps you should try some spelling variations:
filosofia de » filosofia del
de literatur » de literatura, de literatuur, de litterature
studio der » studio oder, studio dei, studio de
studio del » estudio del, studio della, studio delle
tesi » test, teso, temi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tesi allo ((studio der) OR (studio del)) filosofia de literatur*.