Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
ventilation algorithm » estimation algorithm, evolution algorithm
invasive ventilation » adaptive ventilation
modified invasive » modified passive
df estimation » _ estimation
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 estimation algorithms ) OR ( modified invasive ventilation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified df estimation algorithms ) or ( modified invasive ventilation algorithm ))*.