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

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