Perhaps you should try some spelling variations:
de litterature » la litterature, et litterature
de literatura » la literatura, y literatura, a literatura
da filosofia » la filosofia, di filosofia, a filosofia
de studium » dem studium, des studium, d studium
studium da » studium das, studium a, studium d
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 da filosofia ((de literatura) OR (de litterature))*.