Perhaps you should try some spelling variations:
en literatura » e literatura, pena literatura, en litterature
filosofia en » filosofia e, filosofia del, filosofia con
a filosofia » la filosofia, e filosofia, di filosofia
texto » textos, text, texts

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 ((duales studium) OR (das studium)) a filosofia en literatura".
• Adding a wildcard symbol may retrieve word variants: texto ((duales studium) OR (das studium)) a filosofia en literatura*.