Perhaps you should try some spelling variations:
"defined network optimization algorithms" » "defined network optimisation algorithm", "defined network estimation algorithms", "defined network estimation algorithm", "designed network optimization algorithms"
"modified parameter estimation algorithmss" » "modified parameter estimation algorithms", "modified parameter estimation algorithm", "modified parameter estimates algorithmss", "modified parameter optimization algorithmss"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("defined network optimization algorithms") or ("modified parameter estimation algorithmss"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("defined network optimization algorithms") OR ("modified parameter estimation algorithmss")).
• Removing quotes may allow a broader search: (( defined network optimization algorithms ) or ( modified parameter estimation algorithmss )).
• Adding a wildcard symbol may retrieve word variants: (("defined network optimization algorithms") or ("modified parameter estimation algorithmss"))*.