Perhaps you should try some spelling variations:
"modified allocation optimization algorithms" » "modified allocation optimisation algorithm", "modified allocation estimation algorithms", "modified allocation estimation algorithm", "modified location optimization algorithms"
"modified over optimized algorithm" » "modified over optimized algorithms", "modified over optimizer algorithms", "modified near optimized algorithm", "modified orca optimized algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified allocation optimization algorithms\") OR (\"modified over optimized algorithm\"))~".
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