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