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

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