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

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