Perhaps you should try some spelling variations:
"relating machinery using vibration signals" » "rotating machinery using vibration signals", "relating machinery using vibration signal"
"rotating machines using vibration signals" » "rotating machinery using vibration signals", "cleaning machines using vibration signals", "turing machines using vibration signals", "rotating machines using vibration signal"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("rotating machines using vibration signals") or ("relating machinery using vibration signals"))~.
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