Perhaps you should try some spelling variations:
duales studium » das studium
na literatura » la literatura, a literature, y literatura
a literatura » la literatura, a literature, y literatura
e filosofia » la filosofia
et duales » et durables, ein duales, 5 duales
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: et duales studium e filosofia ((na literatura) OR (a literatura)).
• Adding a wildcard symbol may retrieve word variants: et duales studium e filosofia ((na literatura) or (a literatura))*.