Perhaps you should try some spelling variations:
aus filosofia » a filosofia, su filosofia, masse filosofia
da literatura » la literatura, a literatura, de literatura
filosofia da » filosofia de, filosofia del, filosofia e
test modell » tekst modell, test models, text modell
studien aus » studie aus
test model » test models, trust model, cost model

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