Perhaps you should try some spelling variations:
da literature » da literatura, la literature, ca literature
studium am » studium im, studium als, studium das
studium a » studium ad, studium _, studium 1
test dem » test der, test des, test de

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