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

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• Performing a fuzzy search may retrieve terms with similar spellings: (( same ((optimizer algorithms) or (optimized algorithm)) ) or ( sphere estimation algorithms ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( same ((optimizer algorithms) OR (optimized algorithm)) ) OR ( sphere estimation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (( same ((optimizer algorithms) or (optimized algorithm)) ) or ( sphere estimation algorithms ))*.