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 sphere optimisation algorithms" » "modified sphere optimization algorithms", "modified sphere estimation algorithms", "modified sphere estimation algorithm", "modified sphere optimization algorithmss", "modified sphere estimation algorithmss"

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