Perhaps you should try some spelling variations:
tests state » tests static, tests stable, cysts state
a filosofia » la filosofia, e filosofia, di filosofia
filosofia e » filosofia de, filosofia del
test state » test stated, test stage, best state
studied a » studied _, studied 3, studied 5
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) OR (test state)) studied a filosofia e literatur.
• Adding a wildcard symbol may retrieve word variants: ((tests state) or (test state)) studied a filosofia e literatur*.