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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified response association algorithm\") OR (\"modified notion approximation algorithms\"))~".
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