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 estimation algorithmss" » "modified aging estimation algorithm", "modified aging optimization algorithms", "modified aging estimation algorithms", "modified aging optimization algorithmss", "modified aging optimisation algorithms", "modified lighting estimation algorithmss", "modified risk estimation algorithmss", "modified caging estimation algorithmss"

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