Perhaps you should try some spelling variations:
et litterature » la litterature, art literature
di filosofia » la filosofia
a filosofia » la filosofia
e filosofia » la 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: test _ studium ((a filosofia) OR (((di filosofia) OR (e filosofia)))) et litterature.
• The words AND, OR and NOT may confuse the search; try adding quotes: "test _ studium ((a filosofia) or (((di filosofia) OR (e filosofia)))) et litterature".
• Adding a wildcard symbol may retrieve word variants: test _ studium ((a filosofia) or (((di filosofia) OR (e filosofia)))) et litterature*.