Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm
estimation algorithms » estimation algorithm, optimization algorithms, approximation algorithms
invasive estimation » invasive ventilation
modified invasive » modified passive
bi1 optimisation » _ optimisation, _ optimization, qoe optimization
modified bi1 » modified _

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 estimation algorithms ) OR ( modified bi1 optimisation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified invasive estimation algorithms ) or ( modified bi1 optimisation algorithm ))*.