Perhaps you should try some spelling variations:
duales studium » das studium
filosofia igel » filosofia del, filosofia de, filosofia en
test duales » test doubles, test rules, test oracles
filosofia e » filosofia de, filosofia del
studium y » studium _, studium 1, studium 3
literatur » literature

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