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

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