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