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

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 idealen studium ((ds filosofica) OR (e filosofia)) la literatura.
• Adding a wildcard symbol may retrieve word variants: des idealen studium ((ds filosofica) or (e filosofia)) la literatura*.