Perhaps you should try some spelling variations:
de literatuur » de literatura, en literatuur, de litterature
de literatur » de literatura, de litterature, erde literatur
3 filosofia » e filosofia, a filosofia, y filosofia
studium 3 » studium _, studium 1, studium 8
test das » test des, test day, west das

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 das studium 3 filosofia ((de literatur) OR (de literatuur))".
• Adding a wildcard symbol may retrieve word variants: test das studium 3 filosofia ((de literatur) OR (de literatuur))*.