Perhaps you should try some spelling variations:
de litterature » la litterature, et litterature
filosofica de » filosoficas de, filosofia de, filosofica da
studium vida » studium von, studium die, studium das
studium eine » studium die
test dualen » des dualen, test doubles

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 dualen ((studium vida) OR (studium eine)) filosofica de litterature*".