Perhaps you should try some spelling variations:
duales studium » das studium
de litterature » la litterature, et litterature
y literatura » la literatura
test duales » test doubles, test rules, test oracles
e filosofia » la filosofia
studium e » studium _, studium 1, studium 3

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: test duales studium e filosofia ((de litterature) OR (y literatura)).
• Adding a wildcard symbol may retrieve word variants: test duales studium e filosofia ((de litterature) or (y literatura))*.