Perhaps you should try some spelling variations:
optimization algorithms » estimation algorithms, estimation algorithm, optimized algorithms
optimization algorithm » estimation algorithm, estimation algorithms, optimized algorithm
optimisation algorithm » estimation algorithm, estimation algorithms
parameter » parameters

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• Performing a fuzzy search may retrieve terms with similar spellings: parameter ((((optimization algorithm) OR (optimization algorithms))) or (optimisation algorithm))~.
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• Adding a wildcard symbol may retrieve word variants: parameter ((((optimization algorithm) OR (optimization algorithms))) or (optimisation algorithm))*.