Perhaps you should try some spelling variations:
duale studium » duales studium, dualen studium
das filosofia » da filosofia, la filosofia, di filosofia
la literatura » la litterature, a literature
filosofia la » filosofia da, filosofia le, filosofica da
testo » test, tests, texto

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