Perhaps you should try some spelling variations:
modell studien » model studies, models studies, moderne studien
ds filosofia » di filosofia, de filosofia, da filosofia
test modell » tekst modell, test models, test model
studien ds » studien des, studien das, studies ds

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: "test modell studien ds filosofia ((e literatur) OR (die literatur))".
• Adding a wildcard symbol may retrieve word variants: test modell studien ds filosofia ((e literatur) OR (die literatur))*.