Perhaps you should try some spelling variations:
del literatura » de literatura, pela literatura, da literatura
versus acute » versus active, versus actual
de filosofia » e filosofia, di filosofia, la filosofia
tests acute » testis acute, testing acute, tests active
studien de » studien der, studien die, studien des

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 acute) OR (versus acute)) studien de filosofia del literatura*.