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

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