Perhaps you should try some spelling variations:
"modified response association algorithms" » "modified response estimation algorithms", "modified response classification algorithm"
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified response association algorithms") OR ("modified notion approximation algorithms"))~.
• Removing quotes may allow a broader search: (( modified response association algorithms ) or ( modified notion approximation algorithms ))~.
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