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