Perhaps you should try some spelling variations:
modell studien » model studies, models studies, moderne studien
ds filosofia » di filosofia, de filosofia, la filosofia
da filosofia » la filosofia, di filosofia, a filosofia
test modell » tekst modell, test models, test model
e literatur » die literatur

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