Perhaps you should try some spelling variations:
optimisation algorithms » optimization algorithms, estimation algorithm, approximation algorithms
optimisation algorithm » optimization algorithms, estimation algorithm
estimation algorithms » estimation algorithm, optimization algorithms, 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 (optimisation algorithms)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( sphere estimation algorithms ) OR ( _ ((optimisation algorithm) OR (optimisation algorithms)) )).
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