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