Perhaps you should try some spelling variations:
del literatur » model literatur, teil literatur, igel literatur
stents safety » agents safety, events safety, tenth safety
safety study » safety studies, safety stock
di filosofia » la filosofia
e filosofia » la filosofia

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 study ((di filosofia) OR (e filosofia)) del literatur".
• Adding a wildcard symbol may retrieve word variants: stents safety study ((di filosofia) OR (e filosofia)) del literatur*.