Perhaps you should try some spelling variations:
mexico durante » mexico during, mexico ante
filosofia a » filosofia da, filosofia la, filosofia _
filosofia e » filosofia de, filosofia del
studien y » studien _, studien 3, studien 5
studien 4 » studien _, studien 3, studien 5

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 y) OR (studien 4)) ((filosofia a) OR (filosofia e)) literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "mexico durante ((studien y) OR (studien 4)) ((filosofia a) or (filosofia e)) literatura".
• Adding a wildcard symbol may retrieve word variants: mexico durante ((studien y) OR (studien 4)) ((filosofia a) or (filosofia e)) literatura*.