Perhaps you should try some spelling variations:
"modified allocation estimation algorithmss" » "modified allocation estimation algorithms", "modified allocation optimization algorithms", "modified allocation optimization algorithmss", "modified motion estimation algorithmss"
"modified response estimation algorithm" » "modified response optimization algorithm", "modified pose estimation algorithm", "modified response association algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified response estimation algorithm\") OR (\"modified allocation estimation algorithmss\"))~".
• Removing quotes may allow a broader search: (( modified response estimation algorithm ) OR ( modified allocation estimation algorithmss ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified response estimation algorithm") OR ("modified allocation estimation algorithmss"))*.