Perhaps you should try some spelling variations:
"modified allocation optimisation algorithm" » "modified allocation optimization algorithm", "modified allocation optimization algorithms", "modified allocation estimation algorithm", "modified allocation estimation algorithms"
"modified virus predation algorithm" » "modified virus predators algorithm", "modified virus estimation algorithm", "modified virus prediction algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified virus predation algorithm\") OR (\"modified allocation optimisation algorithm\"))~".
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