Perhaps you should try some spelling variations:
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
studien de » studien der, studien die, studien dd

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) OR (studien des)) filosofia ((e literatura) OR (y literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tests space ((studien de) OR (studien des)) filosofia ((e literatura) or (y literatura))".
• Adding a wildcard symbol may retrieve word variants: tests space ((studien de) OR (studien des)) filosofia ((e literatura) or (y literatura))*.