Perhaps you should try some spelling variations:
ventilation algorithm » estimation algorithm, estimation algorithms, evolution algorithm
optimized algorithms » optimized algorithm, optimizer algorithms, optimization algorithms
passive ventilation » adaptive ventilation, invasive ventilation
modified passive » modified adaptive
df optimized » _ optimized, _ optimize
modified df » modified _, modified adam, modified bi1

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 df optimized algorithms ) OR ( modified passive ventilation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified df optimized algorithms ) or ( modified passive ventilation algorithm ))*.