Perhaps you should try some spelling variations:
der filosofica » de filosofia, e filosofica, di filosofia
la literatura » la litterature, a literature
safe studie » safe studio, life studie, case studie
e filosofia » la filosofia
tests safe » tests safety, tests scale, tests space

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 safe studie ((der filosofica) OR (e filosofia)) la literatura".
• Adding a wildcard symbol may retrieve word variants: tests safe studie ((der filosofica) OR (e filosofia)) la literatura*.