Perhaps you should try some spelling variations:
la litterature » a literature
modell studien » model studies, models studies, moderne studien
le literatura » la literatura, de literatura, e literatura
rosi modell » osi modell, osi model, osi modells
e filosofia » la filosofia
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 ((le literatura) OR (la litterature)).
• Adding a wildcard symbol may retrieve word variants: rosi modell studien e filosofia ((le literatura) or (la litterature))*.