Perhaps you should try some spelling variations:
dualen studium » duales studium, duale studium
la literatura » la litterature, a literature
testo dualen » des dualen
da filosofia » la filosofia, a filosofia, de filosofia
di filosofia » la filosofia, e filosofia
d filosofia » de filosofia, e filosofia, a filosofia

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 ((d filosofia) OR (((da filosofia) OR (di filosofia)))) la literatura*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "testo dualen studium ((d filosofia) or (((da filosofia) OR (di filosofia)))) la literatura*".