Perhaps you should try some spelling variations:
die filosofica » di filosofia, de filosofia, e filosofica
filosofica e » filosofia e, filosofica da, filosofia de
e literatura » de literatura, y literatura, e literatur
tests scale » tests stable, sets scale, tests safe
tests table » test tables, results table, test suitable
studies die » studie die, studien die, studies does

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 table)) studies die filosofica e literatura.
• Adding a wildcard symbol may retrieve word variants: ((tests scale) or (tests table)) studies die filosofica e literatura*.