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

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: "tests drug studie 1 ((filosofica e) OR (filosofica da)) literatur".
• Adding a wildcard symbol may retrieve word variants: tests drug studie 1 ((filosofica e) OR (filosofica da)) literatur*.