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

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