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

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