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