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

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