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 invasive convolution algorithms" » "modified invasive evolution algorithm", "modified invasive solution algorithm", "modified invasive ventilation algorithms", "modified passive convolution algorithms"

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 invasive convolution algorithms"))~.
• Removing quotes may allow a broader search: (( modified policy optimization algorithms ) or ( modified invasive convolution algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified policy optimization algorithms") or ("modified invasive convolution algorithms"))*.