Perhaps you should try some spelling variations:
e litterature » et litterature, de litterature, en litterature
filosofia e » filosofia de, filosofia del
studium ad » studium am, studium a, studium band
studium d » studium _, studium 1, studium 3
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 d) OR (studium ad)) filosofia e litterature*".