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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified parameter estimation algorithmss\") OR (\"modified network optimization algorithm\"))~".
• Removing quotes may allow a broader search: (( modified parameter estimation algorithmss ) OR ( modified network optimization algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified parameter estimation algorithmss") OR ("modified network optimization algorithm"))*.