Perhaps you should try some spelling variations:
de litterature » et litterature
la litterature » a literature
duale studium » duales studium, dualen studium, das studium
e filosofia » la filosofia
studium e » studium _, studium 1, studium 3
texts » text

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: "texts duale studium e filosofia ((de litterature) OR (la litterature))".
• Adding a wildcard symbol may retrieve word variants: texts duale studium e filosofia ((de litterature) OR (la litterature))*.