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

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