Perhaps you should try some spelling variations:
"modified parameter optimization algorithmss" » "modified parameter optimization algorithms", "modified parameter optimisation algorithm", "modified parameter estimation algorithm", "modified parameters optimization algorithmss"
"modified adaptive estimation algorithms" » "modified adaptive estimation algorithm", "modified adaptive optimization algorithms", "modified adaptive optimisation algorithm", "modified adaptive ventilation algorithms", "modified quantile estimation algorithms", "modified adaptive quantization algorithms", "modified passive estimation algorithms"

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