Perhaps you should try some spelling variations:
ventilation algorithm » estimation algorithm, estimation algorithms, evolution algorithm
passive ventilation » adaptive ventilation, invasive ventilation
method algorithm » mom algorithm
modified passive » modified adaptive
using method » nursing methods, focusing method, using metal

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: (( (code OR core) using method algorithm ) OR ( modified passive ventilation algorithm ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( (code OR core) using method algorithm ) or ( modified passive ventilation algorithm ))~".
• Adding a wildcard symbol may retrieve word variants: (( (code OR core) using method algorithm ) or ( modified passive ventilation algorithm ))*.