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

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• Performing a fuzzy search may retrieve terms with similar spellings: (( sphere estimation algorithms ) or ( _ ((optimisation algorithm) OR (optimization algorithms)) ))~.
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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( sphere estimation algorithms ) or ( _ ((optimisation algorithm) OR (optimization algorithms)) ))".
• Adding a wildcard symbol may retrieve word variants: (( sphere estimation algorithms ) or ( _ ((optimisation algorithm) OR (optimization algorithms)) ))*.