Perhaps you should try some spelling variations:
duales studium » das studium
igel literatur » teil literatur, l literatur, wahl literatur
test duales » test doubles, test rules, test oracles
y filosofia » a filosofia, la filosofia, di filosofia
e filosofia » la filosofia

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