Perhaps you should try some spelling variations:
"modified adaptive estimation algorithmss" » "modified adaptive estimation algorithm", "modified adaptive optimization algorithms", "modified adaptive estimation algorithms", "modified adaptive optimization algorithmss", "modified adaptive optimisation algorithms", "modified adaptive ventilation algorithmss", "modified quantile estimation algorithmss", "modified adaptive quantization algorithmss"
"modified passive estimation algorithms" » "modified passive estimation algorithm", "modified passive optimization algorithms", "modified passive optimisation algorithm", "modified pose estimation algorithms"

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