Perhaps you should try some spelling variations:
safety theories » society theories, safety series, safety theory
safety stories » safety series, safety steroids, society stories
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: stents ((((safety stories) OR (safety theories))) OR (safety studies)) la filosofia e literatur.
• The words AND, OR and NOT may confuse the search; try adding quotes: "stents ((((safety stories) OR (safety theories))) or (safety studies)) la filosofia e literatur".
• Adding a wildcard symbol may retrieve word variants: stents ((((safety stories) OR (safety theories))) or (safety studies)) la filosofia e literatur*.