Perhaps you should try some spelling variations:
have studied » wave studies
e literatura » de literatura, y literatura, e literatur
e filosofia » la filosofia
filosofia e » filosofia de, filosofia del

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