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

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• Performing a fuzzy search may retrieve terms with similar spellings: (( modified invasive estimation algorithms ) or ( modified adaptive estimation algorithmss ))~.
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