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

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