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 safe, tests shall
studies die » studie die, studien die, studies does

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

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