Perhaps you should try some spelling variations:
filosofia igel » filosofia del, filosofia de, filosofia e
igel literatur » teil literatur, l literatur, wahl literatur
test duales » test doubles, test rules, test oracles
studium y » studium _, studium 3, studium 8
studium 1 » studium _, studium 3, studium 8

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 duales ((studium y) OR (studium 1)) filosofia igel literatur".
• Adding a wildcard symbol may retrieve word variants: test duales ((studium y) OR (studium 1)) filosofia igel literatur*.