Perhaps you should try some spelling variations:
"basiswissen mobile arbeit" » "basiswissen mit arbeit", "basiswissen die arbeit", "basiswissen itil arbeit", "basiswissen mobiler arbeit", "basiswissen mobiles arbeiten", "basiswissen mobile ambient"
"basiswissen dier arbeit" » "basiswissen der arbeit", "basiswissen die arbeit", "basiswissen uber arbeit", "basiswissen dieser arbeit", "basiswissen einer arbeit"

Try widening your search to All Fields.

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: (("basiswissen mobile arbeit") OR ("basiswissen dier arbeit")).
• Removing quotes may allow a broader search: (( basiswissen mobile arbeit ) or ( basiswissen dier arbeit )).
• Adding a wildcard symbol may retrieve word variants: (("basiswissen mobile arbeit") or ("basiswissen dier arbeit"))*.