Perhaps you should try some spelling variations:
estimation algorithmssss » estimation algorithms, estimation algorithm
attributes optimization » attribute optimization
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
parameters estimation » parameter estimation, parameter estimates, parameter 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: (( parameters estimation algorithmssss ) OR ( attributes optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (( parameters estimation algorithmssss ) or ( attributes optimization algorithms ))*.