Perhaps you should try some spelling variations:
space studien » space studies, spaces studied, space student
des filosofia » de filosofia, e filosofia, di filosofia
e literatura » de literatura, e literatur, a literatura
y literatura » la literatura
tests space » test space, texts space, lists space
studien des » studien der, studie des, studien aus

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 studien des filosofia ((e literatura) OR (y literatura)).
• Adding a wildcard symbol may retrieve word variants: tests space studien des filosofia ((e literatura) or (y literatura))*.