Perhaps you should try some spelling variations:
state studies » staff studies, site studies
state studied » have studied, state study, water studied
a filosofia » la filosofia, e filosofia, di filosofia
filosofia e » filosofia de, filosofia del
literatur » literature

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: tests ((state studied) OR (state studies)) a filosofia e literatur.
• Adding a wildcard symbol may retrieve word variants: tests ((state studied) or (state studies)) a filosofia e literatur*.