Perhaps you should try some spelling variations:
filosofia era » filosofia para, filosofia da, filosofia en
des studium » des studiums, das studium, dem studium
filosofia e » filosofia de, filosofia del
studium a » studium am, studium ad, studium _
test des » test der, test test

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "test des studium a ((filosofia era) OR (filosofia e)) literature".
• Adding a wildcard symbol may retrieve word variants: test des studium a ((filosofia era) OR (filosofia e)) literature*.