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 delphi convolution algorithms" » "modified delphi evolution algorithm", "modified delphi solution 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 policy optimization algorithms") OR ("modified delphi convolution algorithms"))~.
• Removing quotes may allow a broader search: (( modified policy optimization algorithms ) or ( modified delphi convolution algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified policy optimization algorithms") or ("modified delphi convolution algorithms"))*.