Perhaps you should try some spelling variations:
del literatura » de literatura, pela literatura, da literatura
testing acute » treating acute, testis acute, detecting acute
die filosofia » di filosofia, de filosofia, e filosofia
tests acute » testis acute, versus 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 (testing acute)) studien die filosofia del literatura*".