Perhaps you should try some spelling variations:
durante studien » ante studien, dante studies, dokumente studien
duale studien » duale studium, scale studien, duales studium
filosofia a » filosofia da, filosofia la, filosofia _
filosofia e » filosofia de, filosofia del

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