Perhaps you should try some spelling variations:
"artech des mobile communications series." » "artech des mobile communication series.", "artech des mobile communications services.", "artech des mobile communication services.", "arten des mobile communications series.", "artech does mobile communications series.", "artech das mobile communications series.", "artech less mobile communications series."
"artech des mobile communication service." » "artech des mobile communication services.", "artech des mobile communications services.", "artech des mobile communication series.", "arten des mobile communication service.", "artech does mobile communication service.", "artech das mobile communication service.", "artech less mobile communication service."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("artech des mobile communications series.") OR ("artech des mobile communication service."))~.
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• Adding a wildcard symbol may retrieve word variants: (("artech des mobile communications series.") OR ("artech des mobile communication service."))*.