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

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