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"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified policy optimisation algorithm") or ("modified parameter optimization algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified policy optimisation algorithm") OR ("modified parameter optimization algorithms")).
• Removing quotes may allow a broader search: (( modified policy optimisation algorithm ) or ( modified parameter optimization algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified policy optimisation algorithm") or ("modified parameter optimization algorithms"))*.