Perhaps you should try some spelling variations:
modell studien » model studies, models studies, moderne studien
filosofia la » filosofia le, filosofica da, filosofia das
filosofia da » filosofia de, filosofia del, filosofia e
rosi modell » osi modell, osi model, osi modells
studien e » studien es, studien _, studien 3

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 e ((filosofia la) OR (filosofia da)) literatura.
• Adding a wildcard symbol may retrieve word variants: rosi modell studien e ((filosofia la) or (filosofia da)) literatura*.