Perhaps you should try some spelling variations:
tests stable » tests table, sets stable, test table
filosofica a » filosofica da, filosofica e, filosofica _
a literatura » la literatura, a literature, y literatura
studies die » studie die, studies does, studies dose
studien die » studie die, studien der
sets scale » sets scaled, sets scales, set scale

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: ((sets scale) OR (tests stable)) ((studies die) OR (studien die)) filosofica a literatura*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((sets scale) or (tests stable)) ((studies die) OR (studien die)) filosofica a literatura*".