Perhaps you should try some spelling variations:
e literatura » de literatura, y literatura, e literatur
rosi modell » osi model, osi modells, rssi model
3 filosofia » e filosofia, a filosofia, y filosofia
filosofia e » filosofia de, filosofia del
osi modell » osi model
studien 3 » studien _, studien 4, studien 5

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: "((rosi modell) OR (osi modell)) studien 3 filosofia e literatura".
• Adding a wildcard symbol may retrieve word variants: ((rosi modell) OR (osi modell)) studien 3 filosofia e literatura*.