Perhaps you should try some spelling variations:
"modified parameter optimization algorithms" » "modified parameter estimation algorithms", "modified parameter estimation algorithm", "modified parameter optimized algorithms", "modified parameters optimization algorithms"
"modified policy optimisation algorithm" » "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 optimization algorithms") OR ("modified policy optimisation algorithm"))~.
• Removing quotes may allow a broader search: (( modified parameter optimization algorithms ) or ( modified policy optimisation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified parameter optimization algorithms") or ("modified policy optimisation algorithm"))*.