Perhaps you should try some spelling variations:
modell studien » model studies, models studies, moderne studien
filosofia la » filosofia da, filosofica da, filosofia das
filosofia le » filosofia de, filosofia e, filosofia del
rosi modell » osi modell, osi model, osi modells
studien es » studien aus, studien bei, studien ein

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: rosi modell studien es ((filosofia la) OR (filosofia le)) literatura.
• Adding a wildcard symbol may retrieve word variants: rosi modell studien es ((filosofia la) or (filosofia le)) literatura*.