Perhaps you should try some spelling variations:
et litterature » la litterature, art literature
de litterature » la litterature
duale studien » duale studium, scale studien, duales studium
texto duale » texto durante
e filosofia » la filosofia
studien e » studien es, studien _, studien 3

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: "texto duale studien e filosofia ((de litterature) OR (et litterature))".
• Adding a wildcard symbol may retrieve word variants: texto duale studien e filosofia ((de litterature) OR (et litterature))*.