Perhaps you should try some spelling variations:
"basiswissen mobiler arbeit" » "basiswissen uber arbeit", "basiswissen mitr arbeit", "basiswissen dier arbeit", "basiswissen itilr arbeit", "basiswissen mobiles arbeiten", "basiswissen sozialer arbeit"
"basiswissen mobile arbeit" » "basiswissen mit arbeit", "basiswissen die arbeit", "basiswissen itil arbeit", "basiswissen mobiles arbeiten", "basiswissen mobile ambient", "basiswissen mobile agent"

Try widening your search to All Fields.

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"basiswissen mobile arbeit\") OR (\"basiswissen mobiler arbeit\"))".
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