Perhaps you should try some spelling variations:
na literatura » la literatura, a literatura, a literature
ii filosofia » di filosofia, la filosofia, e filosofia
filosofia na » filosofia da, filosofia la, filosofia n
ein studium » beim studium, im studium, ins studium
dem studium » das studium, im studium, zum studium

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: text ((ein studium) OR (dem studium)) ii filosofia na literatura*.