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

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