Perhaps you should try some spelling variations:
della filosofia » la filosofia
agents safety » patients safety, plants safety, accidents safety
safety study » safety studies, safety stock
de filosofia » e filosofia, di filosofia, la filosofia
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: agents safety study ((della filosofia) OR (de filosofia)) e literatur.
• Adding a wildcard symbol may retrieve word variants: agents safety study ((della filosofia) or (de filosofia)) e literatur*.