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

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