Perhaps you should try some spelling variations:
stents safety » agents safety, events safety, tenth safety
die filosofia » di filosofia, de filosofia, e filosofia
e literatura » de literatura, y literatura, e literatur
studien die » studie die, studien der
filosofia e » filosofia de, filosofia del

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) OR (plants safety)) studien die filosofia e literatura.
• Adding a wildcard symbol may retrieve word variants: ((stents safety) or (plants safety)) studien die filosofia e literatura*.