Perhaps you should try some spelling variations:
"modified changing estimation algorithmssss" » "modified changing estimation algorithms", "modified changing estimation algorithm", "modified channel estimation algorithmssss", "modified charging station algorithmssss", "modified caging estimation algorithmssss"
"modified objective optimisation algorithm" » "modified objective optimization algorithm", "modified multiobjective optimization algorithm", "modified objective optimization algorithms", "modified objective estimation algorithm", "modified objective estimation algorithms"

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