Perhaps you should try some spelling variations:
des litteratures » et litterature, la litterature, _ literatures
del litterature » et litterature, en litterature, les litteratures
de litterature » la litterature, et litterature
duale studium » duales studium, dualen studium, das studium
e filosofia » la filosofia
text duale » kontext duale
studium e » studium _, studium 1, studium 3

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: text duale studium e filosofia ((del litterature) OR (((des litteratures) OR (de litterature))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "text duale studium e filosofia ((del litterature) or (((des litteratures) OR (de litterature))))*".