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

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