Perhaps you should try some spelling variations:
"modified pulses optimization algorithms" » "modified pulses optimisation algorithm", "modified pulses estimation algorithms", "modified pulses estimation algorithm", "modified pulses optimisation algorithms", "modified pulses estimation algorithmss", "modified policy optimization algorithms"
"modified objective optimization algorithm" » "modified multiobjective optimization algorithm", "modified objective optimisation algorithm", "modified objective estimation algorithm", "modified objective estimation algorithms"

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