Perhaps you should try some spelling variations:
"modified objective optimization algorithmssssss" » "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective optimization algorithmsssssss", "modified objective optimisation algorithmssssss", "modified objective estimation algorithmssssss", "modified multiobjective optimization algorithmssssss"
"modified _ optimization algorithm" » "modified _ optimization algorithms", "modified _ optimisation algorithm", "modified _ estimation algorithm"

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