Perhaps you should try some spelling variations:
della studien » delphi studien, modell studien, della studiosa
da literatura » la literatura, a literatura, de literatura
cella studie » cells studies, cells studied, cell studies
e filosofica » e filosofia, e filosofiche, y filosofia
a filosofia » la filosofia, e filosofia, di filosofia

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