Perhaps you should try some spelling variations:
"phanomenologische untersuchungen" » "phanomenologische untersuchung", "pharmakologische untersuchungen", "neuphanomenologische untersuchung"
"phonologische untersuchung" » "ikonologische untersuchung", "proktologische untersuchung", "theologische untersuchung"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("phonologische untersuchung") OR ("phanomenologische untersuchungen")).
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