Perhaps you should try some spelling variations:
der filosofica » e filosofica, e filosofia, di filosofia
da literatura » la literatura, a literatura, de literatura
de filosofia » e filosofia, di filosofia, la filosofia
test als » test acts, test a, test ast

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 als) OR (test act)) studien ((der filosofica) OR (de filosofia)) da literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((test als) OR (test act)) studien ((der filosofica) or (de filosofia)) da literatura".
• Adding a wildcard symbol may retrieve word variants: ((test als) OR (test act)) studien ((der filosofica) or (de filosofia)) da literatura*.