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
male optimisation » game optimization, market optimization, stage optimization
modified invasive » modified passive

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