Perhaps you should try some spelling variations:
estimation algorithmss » estimation algorithms, estimation algorithm, optimization algorithms
estimates algorithms » estimation algorithms, estimation algorithm, optimized algorithms
parameter estimates » parameter estimation
sphere estimation » pose 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 estimation algorithmss ) OR ( parameter estimates algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (( sphere estimation algorithmss ) or ( parameter estimates algorithms ))*.