Perhaps you should try some spelling variations:
de litterature » la litterature, et litterature
ds filosofica » di filosofia, de filosofia, da filosofia
de literatura » la literatura, y literatura, a literatura
studium ds » studium des, studium das, studium d
des das » des dass, des dab, des dac

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