Perhaps you should try some spelling variations:
e literatura » de literatura, y literatura, e literatur
filosofia e » filosofia de, filosofia del
test have » tests have, test wave, west have
studied e » studied 3, studied 5, studied 1

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: "test have ((studied e) OR (studied _)) filosofia e literatura".
• Adding a wildcard symbol may retrieve word variants: test have ((studied e) OR (studied _)) filosofia e literatura*.