Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm
response optimisation » response optimization
estimation algorithms » estimation algorithm, optimization algorithms, approximation algorithms
same estimation » pose estimation, sphere estimation

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