Perhaps you should try some spelling variations:
die filosofica » di filosofia, de filosofia, e filosofica
tests stable » tests table, sets stable, test table
filosofica a » filosofica da, filosofica e, filosofica _
a literatura » la literatura, a literature, y literatura
tests scale » sets scale, tests shall, tests small
studies die » studie die, studien die, studies does
tests safe » tests safety, tests space, tests tafel

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 safe) OR (tests scale))) OR (tests stable)) studies die filosofica a literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tests safe) OR (tests scale))) or (tests stable)) studies die filosofica a literatura".
• Adding a wildcard symbol may retrieve word variants: ((((tests safe) OR (tests scale))) or (tests stable)) studies die filosofica a literatura*.