Perhaps you should try some spelling variations:
duales studium » das studium
igel literatur » teil literatur, wahl literatur, kapitel literatur
test duales » test doubles, test rules, test oracles
y filosofia » e filosofia, a filosofia, la filosofia
l literatur » teil literatur
studium y » studium _, studium 1, studium 3

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