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