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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified _ optimisation algorithm\") OR (\"modified parameters optimisation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified _ optimisation algorithm ) OR ( modified parameters optimisation algorithms ))~.
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