Perhaps you should try some spelling variations:
de literatura » de litterature, la literatura, y literatura
filosofia de » filosofia del
tests space » test space, lists space, meets space
texts space » text space, meets space, sets space
e filosofia » la filosofia
studied e » studied _, studied 3, 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 space) OR (texts space)) studied e filosofia de literatura.
• Adding a wildcard symbol may retrieve word variants: ((tests space) or (texts space)) studied e filosofia de literatura*.