Perhaps you should try some spelling variations:
"Optical disks -- Library applications" » "Optical disks -- Library implications", "Optical disks -- Library publications"
"Optical discs -- Library applications" » "Optical discs -- Library implications", "Optical discs -- Library publications", "Optical disc -- Library applications"
"optical risks -- library applications" » "optical risks -- library implications", "optical risks -- library publications", "optical risk -- library applications"

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("Optical disks -- Library applications") OR ("Optical discs -- Library applications"))) or ("optical risks -- library applications"))~.
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