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