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