Perhaps you should try some spelling variations:
"defined network approximation algorithm" » "defined network approximation algorithms", "designed network approximation algorithm"
"modified policy optimisation algorithm" » "modified policy optimization algorithms", "modified policy estimation algorithm", "modified policy estimation algorithms", "modified policy optimization algorithm", "modified topology optimization 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: (("defined network approximation algorithm") OR ("modified policy optimisation algorithm"))~.
• Removing quotes may allow a broader search: (( defined network approximation algorithm ) or ( modified policy optimisation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("defined network approximation algorithm") or ("modified policy optimisation algorithm"))*.