Perhaps you should try some spelling variations:
da literatura » la literatura, a literatura, de literatura
filosofia da » filosofia de, filosofia del, filosofia e
e filosofia » la filosofia
sets class » set class, insets class, sets classes
sets cass » sets case, sets gass, sets chaos

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: ((sets cass) OR (sets class)) studies e filosofia da literatura*.