Perhaps you should try some spelling variations:
"parameters estimation algorithms" » "parameter estimates algorithms", "parameter optimization algorithms", "parameters estimation algorithm", "parameters optimization algorithms", "parameters optimisation algorithm"
"parameter estimation algorithmssssssssss" » "parameter estimation algorithmsssssssss", "parameter optimization algorithmssssssssss", "parameter optimisation algorithmsssssssss", "parameter estimates algorithmssssssssss"

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: (("parameter estimation algorithmssssssssss") OR ("parameters estimation algorithms"))~.
• Removing quotes may allow a broader search: (( parameter estimation algorithmssssssssss ) or ( parameters estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("parameter estimation algorithmssssssssss") or ("parameters estimation algorithms"))*.