Perhaps you should try some spelling variations:
estimation algorithmss » estimation algorithm, optimization algorithms
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
parameters estimation » parameter estimation, parameter estimates, parameter optimization
attribute estimation » attribute optimization

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( attribute estimation algorithms ) or ( parameters estimation algorithmss ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( attribute estimation algorithms ) OR ( parameters estimation algorithmss )).
• Adding a wildcard symbol may retrieve word variants: (( attribute estimation algorithms ) or ( parameters estimation algorithmss ))*.