Perhaps you should try some spelling variations:
safety studien » safety studies, safety study, safety stories
stents safety » agents safety, events safety, tenth safety
filosofia da » filosofia del, filosofia e, filosofia della
filosofia de » filosofia del
studien a » studien am, studien _, studien 3

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "stents safety studien a ((filosofia da) OR (filosofia de)) literatura*".