Perhaps you should try some spelling variations:
la litterature » a literature
duale studium » duales studium, dualen studium, das studium
ds filosofica » di filosofia, da filosofia, e filosofica
de filosofia » e filosofia, di filosofia, la filosofia
des duale » des dualen, das duale, der duale

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: des duale studium ((ds filosofica) OR (de filosofia)) la litterature.
• Adding a wildcard symbol may retrieve word variants: des duale studium ((ds filosofica) or (de filosofia)) la litterature*.