Perhaps you should try some spelling variations:
"optical disks -- iraq implications" » "optical disks -- its implications", "optical disks -- _ implications", "optical discs -- iraq implications"
"optical disks -- its implication" » "optical disks -- its implications", "optical discs -- its implication"
"optical risks -- its implication" » "optical risks -- its implications"
"optical disks -- library applications" » "optical discs -- library applications"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("optical disks -- library applications") or ((("optical disks -- iraq implications") or ((("optical disks -- its implication") OR ("optical risks -- its implication"))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("optical disks -- library applications") OR ((("optical disks -- iraq implications") OR ((("optical disks -- its implication") OR ("optical risks -- its implication")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"optical disks -- library applications\") or (((\"optical disks -- iraq implications\") or (((\"optical disks -- its implication\") OR (\"optical risks -- its implication\"))))))".
• Removing quotes may allow a broader search: (( optical disks -- library applications ) or ((( optical disks -- iraq implications ) or ((( optical disks -- its implication ) OR ( optical risks -- its implication )))))).
• Adding a wildcard symbol may retrieve word variants: (("optical disks -- library applications") or ((("optical disks -- iraq implications") or ((("optical disks -- its implication") OR ("optical risks -- its implication"))))))*.

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