Perhaps you should try some spelling variations:
le literatura » la literatura, de literatura, e literatura
filosofia le » filosofia de, filosofia e, filosofia del
studien die » studie die
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 die) OR (studien der)) filosofia le literatura".
• Adding a wildcard symbol may retrieve word variants: testo duale ((studien die) OR (studien der)) filosofia le literatura*.