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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( _ ((optimization algorithm) OR (optimisation algorithm)) ) OR ( _ optimisation algorithms ))~".
• Adding a wildcard symbol may retrieve word variants: (( _ ((optimization algorithm) OR (optimisation algorithm)) ) OR ( _ optimisation algorithms ))*.