Perhaps you should try some spelling variations:
ventilation algorithm » estimation algorithm, estimation algorithms, evolution algorithm
passive ventilation » adaptive ventilation, invasive ventilation
solution algorithm » evolution algorithm, convolution algorithms, evolutionary algorithm
modified passive » modified adaptive
passive solution » positive solutions, saline solution

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified passive ventilation algorithm ) OR ( modified passive solution algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified passive ventilation algorithm ) or ( modified passive solution algorithm ))*.