Perhaps you should try some spelling variations:
die filosofica » di filosofia, de filosofia, e filosofica
studenten die » studenten der, studenten des, studenten und
filosofica la » filosofica da, filosofia la, filosofia da
la literatura » la litterature, a literature
tests stable » tests table, sets stable, test table
tests scale » sets scale, tests safe, tests shall

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)) studenten die filosofica la literatura.
• Adding a wildcard symbol may retrieve word variants: ((tests scale) or (tests stable)) studenten die filosofica la literatura*.