Perhaps you should try some spelling variations:
"modified objective optimisation algorithm" » "modified objective optimization algorithm", "modified multiobjective optimization algorithm", "modified objective optimization algorithms", "modified objective estimation algorithm", "modified objective estimation algorithms"
"modified df predators algorithm" » "modified df predation algorithm", "modified _ predators algorithm", "modified adam predators algorithm", "modified bi1 predators algorithm"

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