Perhaps you should try some spelling variations:
della studien » delphi studien, modell studien, della studiosa
cella studie » cells studies, cells studied, cell studies
filosofia le » filosofia de, filosofia del, filosofia da
filosofia e » filosofia de, filosofia del

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) OR (cella studie)) _ ((filosofia le) OR (filosofia e)) literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "testi ((della studien) OR (cella studie)) _ ((filosofia le) or (filosofia e)) literatura".
• Adding a wildcard symbol may retrieve word variants: testi ((della studien) OR (cella studie)) _ ((filosofia le) or (filosofia e)) literatura*.