Perhaps you should try some spelling variations:
safety stories » safety studies, safety series, safety steroids
safety studie » safety studies, safety study, safety state
der filosofia » de filosofia, e filosofia, da filosofia
le literatura » la literatura, de literatura, e literatura
di filosofia » la filosofia, e filosofia

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 ((safety studie) OR (safety stories)) ((der filosofia) OR (di filosofia)) le literatura*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tests ((safety studie) OR (safety stories)) ((der filosofia) or (di filosofia)) le literatura*".