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

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