Perhaps you should try some spelling variations:
della literatura » della letteratura, pela literatura, nella letteratura
filosofia della » filosofia del, filosofia de
der filosofia » de filosofia, e filosofia, di filosofia
tests during » costs during, protests during, testing during
studie der » studium der
test drug » tests drug, best drugs, test du

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 during) OR (test drug)) studie der filosofia della literatura.
• Adding a wildcard symbol may retrieve word variants: ((tests during) or (test drug)) studie der filosofia della literatura*.