Perhaps you should try some spelling variations:
della literatura » della letteratura, pela literatura, nella letteratura
filosofia della » filosofia del, filosofia de
testing drugs » testing drug, existing drugs, acting drugs
drugs studied » drugs studies, drug studies, groups studied
de filosofia » e filosofia, di filosofia, la filosofia
studied de » studie de, studied d, studies de

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: testing drugs studied de filosofia della literatura*.