Perhaps you should try some spelling variations:
de literatura » de litterature, la literatura, y literatura
cities space » cities state, cities impact, cities places
filosofia de » filosofia del
e filosofia » la filosofia
its space » its spaces, its splice
studied e » studied _, studied 3, studied 5

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: "((its space) OR (cities space)) studied e filosofia de literatura".
• Adding a wildcard symbol may retrieve word variants: ((its space) OR (cities space)) studied e filosofia de literatura*.