Perhaps you should try some spelling variations:
de literatura » de litterature, la literatura, y literatura
e literatura » y literatura, e literatur, a literatura
burst scale » bast scale, best scale, just scale
studien es » studien aus, studien bei, studien ein
studien e » studien _, studien 3, studien 4

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