Perhaps you should try some spelling variations:
duale studium » duales studium, dualen studium, das studium
des filosofia » de filosofia, di filosofia, da filosofia
la literatura » la litterature, a literature
e filosofia » la filosofia
test duale » test double, test delle, test orale

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