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

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• Performing a fuzzy search may retrieve terms with similar spellings: (( modified parameters optimisation algorithm ) or ( modified parameter optimisation algorithms ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified parameters optimisation algorithm ) OR ( modified parameter optimisation algorithms ))*.