Perhaps you should try some spelling variations:
della studien » cella studie, delphi studien, modell studien
filosofia da » filosofia de, filosofia del, filosofia e
filosofia le » filosofia de, filosofia e, filosofia del
testi della » test della, testa della, testi delle
studien a » studien am, studien _, studien 3

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: testi della studien a ((filosofia da) OR (filosofia le)) literatura.
• Adding a wildcard symbol may retrieve word variants: testi della studien a ((filosofia da) or (filosofia le)) literatura*.