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

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