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

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• Performing a fuzzy search may retrieve terms with similar spellings: (( sphere estimation algorithmss ) or ( cover estimations algorithms ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( sphere estimation algorithmss ) OR ( cover estimations algorithms )).
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