Perhaps you should try some spelling variations:
doubles studium » duales studium, duale studium, dualen studium
di filosofia » la filosofia
a literatura » la literatura, a literature, y literatura
e filosofia » la filosofia
test » text

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