Perhaps you should try some spelling variations:
lengua literatura » lingual literature, language literature, la literatura
pena literatura » pela literatura, na literatura, la literatura
duale studien » duale studium, scale studien, duales studium
texto duale » texto durante
3 filosofia » a filosofia, y filosofia, _ filosofia
e filosofia » la filosofia

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: texto duale studien ((3 filosofia) OR (e filosofia)) ((pena literatura) OR (lengua literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "texto duale studien ((3 filosofia) or (e filosofia)) ((pena literatura) OR (lengua literatura))".
• Adding a wildcard symbol may retrieve word variants: texto duale studien ((3 filosofia) or (e filosofia)) ((pena literatura) OR (lengua literatura))*.