Perhaps you should try some spelling variations:
tales studies » states studies, games studies, cases studies
a literatura » la literatura, y literatura, a literatur
e filosofia » la filosofia
los tales » los males, los vales, los metales

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 tales studies e filosofia ((a literatura) OR (a literature))*".