Perhaps you should try some spelling variations:
filosofica da » filosofia da, filosofia de, filosofia di
tests during » costs during, protests during, testing during
filosofica e » filosofia e, filosofia de, filosofia _
tests drug » test drug, testing drug
studie 1 » studie 2, studie _

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: ((tests drug) OR (tests during)) studie 1 ((filosofica e) OR (filosofica da)) literatur.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tests drug) OR (tests during)) studie 1 ((filosofica e) or (filosofica da)) literatur".
• Adding a wildcard symbol may retrieve word variants: ((tests drug) OR (tests during)) studie 1 ((filosofica e) or (filosofica da)) literatur*.