Perhaps you should try some spelling variations:
e literature » e literatur, life literature, prose literature
tests state » test state, tests static, tests stable
studied 3.3 » studies 3.3
filosofia e » filosofia de, filosofia del
studied a » studied _, studied 5, studied 1
studied 3 » studied _, studied 5

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: tests state ((studied a) OR (((studied 3) OR (studied 3.3)))) filosofia e literature.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tests state ((studied a) or (((studied 3) OR (studied 3.3)))) filosofia e literature".
• Adding a wildcard symbol may retrieve word variants: tests state ((studied a) or (((studied 3) OR (studied 3.3)))) filosofia e literature*.