Perhaps you should try some spelling variations:
des filosofia » e filosofia, di filosofia, da filosofia
la literature » la litterature, a literature, la literatura
de filosofia » e filosofia, di filosofia, la filosofia
tests das » tests des, test das, tests data

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 das studium ((des filosofia) OR (de filosofia)) la literature".
• Adding a wildcard symbol may retrieve word variants: tests das studium ((des filosofia) OR (de filosofia)) la literature*.