Perhaps you should try some spelling variations:
die filosofia » di filosofia, de filosofia, da filosofia
da literature » a literature, da literatura, la literature
e filosofia » la filosofia
auf studie » auf studium, auf stufe, hf studie
tests auf » test auf, tests a

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 auf studie ((die filosofia) OR (e filosofia)) da literature".
• Adding a wildcard symbol may retrieve word variants: tests auf studie ((die filosofia) OR (e filosofia)) da literature*.