Perhaps you should try some spelling variations:
duale studium » duales studium, dualen studium, das studium
der filosofia » de filosofia, e filosofia, da filosofia
la literatura » la litterature, a literature
di filosofia » la filosofia, e filosofia
tests duale » tests due, tests scale, tests damage

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