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

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