Perhaps you should try some spelling variations:
del literatura » de literatura, pela literatura, da literatura
die filosofia » di filosofia, de filosofia, e filosofia
tests scale » tests stable, sets scale, tests safe
studien die » studie die, studien der
test table » test tables, tests table, test tabelle

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 scale) OR (test table)) studien die filosofia del literatura*.