Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
ventilation algorithm » estimation algorithm, estimation algorithms, evolution algorithm
invasive ventilation » adaptive ventilation
seird approximation » time approximation, network approximation
modified invasive » modified passive
modified seird » modified near

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 algorithm ) OR ( modified seird approximation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified invasive ventilation algorithm ) or ( modified seird approximation algorithm ))*.