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

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: ((testis acute) OR (testing acute)) studien die filosofia del literatura*.