Perhaps you should try some spelling variations:
"modified policy estimation algorithmss" » "modified policy estimation algorithms", "modified policy optimization algorithms", "modified policy optimization algorithmss", "modified pose estimation algorithmss", "modified motion estimation algorithmss"
"modified parameters estimation algorithm" » "modified parameter estimation algorithm", "modified parameter estimates algorithm", "modified parameter 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 estimation algorithmss") or ("modified parameters estimation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified policy estimation algorithmss") OR ("modified parameters estimation algorithm")).
• Removing quotes may allow a broader search: (( modified policy estimation algorithmss ) or ( modified parameters estimation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified policy estimation algorithmss") or ("modified parameters estimation algorithm"))*.