Perhaps you should try some spelling variations:
"modified allocation optimisation algorithms" » "modified allocation optimization algorithms", "modified allocation optimisation algorithm", "modified allocation estimation algorithms"
"modified response optimization algorithm" » "modified response optimization algorithms", "modified response optimisation algorithm", "modified response estimation algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified response optimization algorithm\") OR (\"modified allocation optimisation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified response optimization algorithm ) OR ( modified allocation optimisation algorithms ))~.
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