Perhaps you should try some spelling variations:
"online data processing -- library applications -- congresses" » "online data processing -- library implications -- congresses", "online data processing -- library publications -- congresses"
"Online dato processing -- Library applications -- Congresses" » "Online dato processing -- Library implications -- Congresses", "Online dato processing -- Library publications -- Congresses"
"Online image processing -- Library applications -- Congresses" » "Online image processing -- Library implications -- Congresses", "Online image processing -- Library publications -- Congresses"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("online data processing -- library applications -- congresses") OR ((("Online dato processing -- Library applications -- Congresses") OR ("Online image processing -- Library applications -- Congresses"))))~.
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• Removing quotes may allow a broader search: (( online data processing -- library applications -- congresses ) or ((( Online dato processing -- Library applications -- Congresses ) OR ( Online image processing -- Library applications -- Congresses ))))~.
• Adding a wildcard symbol may retrieve word variants: (("online data processing -- library applications -- congresses") or ((("Online dato processing -- Library applications -- Congresses") OR ("Online image processing -- Library applications -- Congresses"))))*.

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