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

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

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