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

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