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

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