Perhaps you should try some spelling variations:
die filosofica » di filosofia, de filosofia, e filosofica
de litterature » la litterature, et litterature
filosofica de » filosoficas de, filosofia de, filosofica da
studium die » studium der, studium des
des dualen » der dualen, des idealen

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 dualen) OR (des dualen)) studium die filosofica de litterature*".