Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective optimisation algorithm"
"modified aging optimization algorithmss" » "modified aging optimization algorithms", "modified aging optimisation algorithm", "modified aging estimation algorithm", "modified staffing optimization algorithmss", "modified game optimization algorithmss", "modified caging optimization algorithmss"

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