Perhaps you should try some spelling variations:
space studied » spaces studied, space studies, state studied
de literatura » de litterature, y literatura, a literatura
la literatura » la litterature, a literature
cities space » cities state, cities impact, cities places
e filosofia » la filosofia
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: "cities space studied e filosofia ((de literatura) OR (la literatura))".
• Adding a wildcard symbol may retrieve word variants: cities space studied e filosofia ((de literatura) OR (la literatura))*.