Perhaps you should try some spelling variations:
"modified _ optimization algorithmsss" » "modified _ optimization algorithms", "modified _ optimisation algorithm", "modified _ estimation algorithms", "modified _ optimization algorithmssss", "modified _ optimisation algorithmsss", "modified _ estimation algorithmsss"
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"

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