Perhaps you should try some spelling variations:
"parameters estimation algorithmssssss" » "parameters estimation algorithms", "parameters estimation algorithm", "parameter estimation algorithmssssss", "parameter estimates algorithmssssss", "parameter optimization algorithmssssss"
"attribute optimization algorithm" » "attribute optimization algorithms", "attribute optimisation algorithm", "attribute estimation algorithm", "attributed optimization algorithm", "attributes optimization algorithm"

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 algorithmssssss") OR ("attribute optimization algorithm"))~.
• Removing quotes may allow a broader search: (( parameters estimation algorithmssssss ) or ( attribute optimization algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("parameters estimation algorithmssssss") or ("attribute optimization algorithm"))*.