Perhaps you should try some spelling variations:
delle studien » duale studien, delphi studien, modell studien
de literatura » de litterature, la literatura, y literatura
filosofia de » filosofia del
tesi delle » testi delle, test delle, testi della

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

• Adding a wildcard symbol may retrieve word variants: tesi delle studien _ filosofia de literatura*.