Perhaps you should try some spelling variations:
di filosofica » di filosofia, de filosofia, da filosofia
filosofica da » filosofia da, filosofia de, filosofia di
da literatura » la literatura, a literatura, de literatura
tests stable » tests table, sets stable, test table
tests scale » sets scale, tests safe, tests shall
studien di » studien die, studien dd, studien der

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 scale) OR (tests stable)) studien di filosofica da literatura.
• Adding a wildcard symbol may retrieve word variants: ((tests scale) or (tests stable)) studien di filosofica da literatura*.