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

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "test della studien em ((filosofia a) OR (filosofia da)) literature".
• Adding a wildcard symbol may retrieve word variants: test della studien em ((filosofia a) OR (filosofia da)) literature*.