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 da
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 le) OR (filosofia del)))) literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "rosi modell studien e ((filosofia la) or (((filosofia le) OR (filosofia del)))) literatura".
• Adding a wildcard symbol may retrieve word variants: rosi modell studien e ((filosofia la) or (((filosofia le) OR (filosofia del)))) literatura*.