Perhaps you should try some spelling variations:
la literatura » la litterature, a literature
agents based » agent based
e filosofica » e filosofia, e filosofiche, y filosofia
a filosofia » la filosofia, e filosofia, di filosofia
sets based » arts based

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: ((sets based) OR (agents based)) studien ((e filosofica) OR (a filosofia)) la literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((sets based) or (agents based)) studien ((e filosofica) OR (a filosofia)) la literatura".
• Adding a wildcard symbol may retrieve word variants: ((sets based) or (agents based)) studien ((e filosofica) OR (a filosofia)) la literatura*.