Perhaps you should try some spelling variations:
"modified policy optimization algorithm" » "modified policy optimization algorithms", "modified policy optimisation algorithm", "modified policy estimation algorithm", "modified topology optimization algorithm"
"modified adaptive evolution algorithm" » "modified adaptive solution algorithm", "modified adaptive evolutionary algorithm", "modified adaptive convolution algorithms", "modified adaptive ventilation algorithm", "modified passive evolution 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 adaptive evolution algorithm") OR ("modified policy optimization algorithm"))~.
• Removing quotes may allow a broader search: (( modified adaptive evolution algorithm ) or ( modified policy optimization algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified adaptive evolution algorithm") or ("modified policy optimization algorithm"))*.