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

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