Perhaps you should try some spelling variations:
"modified allocation optimisation algorithm" » "modified allocation optimization algorithm", "modified allocation optimization algorithms", "modified allocation estimation algorithms"
"modified over estimation algorithm" » "modified cover estimations algorithm", "modified pose estimation algorithm", "modified sphere estimation algorithm", "modified near estimation algorithm", "modified orca estimation algorithm"

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