Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
estimations algorithm » estimation algorithm, optimisation algorithm
parameter estimation » parameter estimates, parameter optimization
cover estimations » pose estimation

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