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

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