Perhaps you should try some spelling variations:
y literatura » la literatura
filosofia y » filosofia e, filosofia _, filosofia de
a filosofia » la filosofia, e filosofia, di filosofia
test des » test der, test test
studie a » studie am, studie 2, studie _
test de » test der, est de

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: ((test de) OR (test des)) studie a filosofia y literatura.
• Adding a wildcard symbol may retrieve word variants: ((test de) or (test des)) studie a filosofia y literatura*.