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

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