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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"parameters estimation algorithmssssssssss\") OR (\"parameter estimation algorithms\"))~".
• Removing quotes may allow a broader search: (( parameters estimation algorithmssssssssss ) OR ( parameter estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("parameters estimation algorithmssssssssss") OR ("parameter estimation algorithms"))*.