Perhaps you should try some spelling variations:
"modified multiobjective optimisation algorithm" » "modified multiobjective optimization algorithm", "modified objective optimization algorithm", "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective estimation algorithms"
"modified changing optimizer algorithms" » "modified changing optimized algorithms", "modified changing optimized algorithm", "modified changing optimization algorithms", "modified choosing optimizer algorithms", "modified caging optimizer algorithms"

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