Perhaps you should try some spelling variations:
cases studies » case studies, games studies
filosofia y » filosofia _, filosofia de, filosofia da
filosofia e » filosofia de, filosofia del
studies de » studies der, studies die, studies doe
los cases » los casos, los paises, los chaves

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: "los cases studies de ((filosofia y) OR (filosofia e)) literatura*".