Perhaps you should try some spelling variations:
stents safety » agents safety, events safety, tenth safety
e literatura » de literatura, y literatura, e literatur
filosofia e » filosofia de, filosofia del
study dem » study demo, study der, study dcm
study d0m » study dcm, study demo, study dfma

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 dem) OR (study d0m)) filosofia e literatura".
• Adding a wildcard symbol may retrieve word variants: stents safety ((study dem) OR (study d0m)) filosofia e literatura*.