Perhaps you should try some spelling variations:
a litterature » la litterature, a literature, _ litterature
filosofia a » filosofia da, filosofia la, filosofia e
studium ad » studium am, studium d, studium band
studium a » studium am, studium _, studium 1
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) OR (studium ad)) filosofia a litterature".
• Adding a wildcard symbol may retrieve word variants: test des ((studium a) OR (studium ad)) filosofia a litterature*.