Perhaps you should try some spelling variations:
modell studien » model studies, models studies, moderne studien
am filosofia » em filosofia, la filosofia, e filosofia
a literatura » la literatura, a literature, y literatura
test modell » tekst modell, test models, test model
a filosofia » la filosofia, e filosofia, di filosofia

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 ((am filosofia) OR (a filosofia)) a literatura".
• Adding a wildcard symbol may retrieve word variants: test modell studien ((am filosofia) OR (a filosofia)) a literatura*.