Perhaps you should try some spelling variations:
dualen studium » duales studium
duale studium » duales studium, das studium
da filosofica » da filosofia, vida filosofica, di filosofia
da literatura » la literatura, a literatura, de literatura

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: testo ((dualen studium) OR (duale studium)) ((da filosofica) OR (la filosofia)) da literatura*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "testo ((dualen studium) or (duale studium)) ((da filosofica) OR (la filosofia)) da literatura*".