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

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