Perhaps you should try some spelling variations:
optimization algorithms » estimation algorithms, estimation algorithm, optimized algorithms
optimisation algorithm » estimation algorithm, estimation algorithms
sphere optimisation » sphere estimation
sphere optimization » sphere estimation, stage optimization, response optimization

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: (( sphere optimisation algorithm ) OR ( sphere optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (( sphere optimisation algorithm ) or ( sphere optimization algorithms ))*.