Perhaps you should try some spelling variations:
die filosofica » di filosofia, de filosofia, e filosofica
la literatura » la litterature, a literature
a literatura » a literature, y literatura, a literatur
safe studie » safe studio, case studie, safe stupid
life studie » life studies, life study, life stories

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