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

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified parameter optimization algorithms") OR ("modified policy optimisation algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified parameter optimization algorithms\") OR (\"modified policy optimisation algorithms\"))".
• Removing quotes may allow a broader search: (( modified parameter optimization algorithms ) OR ( modified policy optimisation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified parameter optimization algorithms") OR ("modified policy optimisation algorithms"))*.