Perhaps you should try some spelling variations:
stents safety » agents safety, events safety, tenth safety
safety study » safety studies, safety stock
de filosofia » e filosofia, di filosofia, a filosofia
e literatura » de literatura, y literatura, e literatur

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 ((de filosofia) OR (la filosofia)) e literatura".
• Adding a wildcard symbol may retrieve word variants: stents safety study ((de filosofia) OR (la filosofia)) e literatura*.