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

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( modified male estimation algorithms ) or ( modified passive ventilation algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified male estimation algorithms ) OR ( modified passive ventilation algorithm )).
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