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

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified sphere optimization algorithmss") OR ("modified objective optimization algorithms")).
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