Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
ventilation algorithms » estimation algorithms, estimation algorithm, convolution algorithms
invasive ventilation » adaptive ventilation
near approximation » one approximation, network approximation, _ approximation
modified invasive » modified passive
modified near » modified seird, modified adam

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