Perhaps you should try some spelling variations:
ventilation algorithms » estimation algorithms, estimation algorithm, convolution algorithms
objective optimisation » objective optimization, multiobjective optimization
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
invasive ventilation » adaptive ventilation
modified invasive » modified passive

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• Performing a fuzzy search may retrieve terms with similar spellings: (( modified invasive ventilation algorithms ) OR ( modified objective optimisation algorithm ))~.
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