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

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((tests acute) OR (versus acute)) studien die filosofia del literatura*".