Perhaps you should try some spelling variations:
testing drugs » testing drug, existing drugs, acting drugs
drugs studied » drugs studies, drug studies, groups studied
e filosofica » e filosofia, e filosofiche, a filosofia
filosofica e » filosofia e, filosofica da, filosofia de
studied e » studied _, studied 3, studied 5
literatur » literature

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• Adding a wildcard symbol may retrieve word variants: testing drugs studied e filosofica e literatur*.