Perhaps you should try some spelling variations:
a literatura » la literatura, y literatura, a literatur
westen das » testen das, west das, westen der
studium e » studium _, studium 1, studium 8
studium 3 » studium _, studium 1, studium 8
test » text

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 _) OR (westen das)) ((studium e) OR (studium 3)) filosofica ((a literatura) OR (a literature)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((test _) or (westen das)) ((studium e) OR (studium 3)) filosofica ((a literatura) or (a literature))".
• Adding a wildcard symbol may retrieve word variants: ((test _) or (westen das)) ((studium e) OR (studium 3)) filosofica ((a literatura) or (a literature))*.