Perhaps you should try some spelling variations:
dualen studium » duales studium, duale studium
die filosofia » di filosofia, de filosofia, e filosofia
la literatura » la litterature
studium die » studium der, studium des

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 OR texto) dualen studium die filosofia ((la literatura) OR (a literature)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(testo or texto) dualen studium die filosofia ((la literatura) OR (a literature))".
• Adding a wildcard symbol may retrieve word variants: (testo or texto) dualen studium die filosofia ((la literatura) OR (a literature))*.