Perhaps you should try some spelling variations:
la litterature » a literature
duale studien » duale studium, scale studien, duales studium
der filosofia » de filosofia, e filosofia, di filosofia
la literatura » a literature
studien der » studie der, studenten der
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 studien der filosofia ((la literatura) OR (la litterature))".
• Adding a wildcard symbol may retrieve word variants: testo duale studien der filosofia ((la literatura) OR (la litterature))*.