Perhaps you should try some spelling variations:
la literatura » la litterature, a literature
studium ders » studium des, studiums der, studium das
filosofia la » filosofia da, filosofia le, filosofica da
test de » test der, test des, 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 ((studium der) OR (studium ders)) filosofia la literatura.
• Adding a wildcard symbol may retrieve word variants: test de ((studium der) or (studium ders)) filosofia la literatura*.