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