Perhaps you should try some spelling variations:
estimations algorithms » estimation algorithms, estimation algorithm, optimization algorithms
pose approximation » time approximation, _ approximation, rough approximations
cover estimations » pose estimation
one approximation » time approximation, _ approximation, rough approximations

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• Performing a fuzzy search may retrieve terms with similar spellings: (( cover estimations algorithms ) or ( ((pose approximation) or (one approximation)) algorithms ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cover estimations algorithms ) OR ( ((pose approximation) OR (one approximation)) algorithms )).
• Adding a wildcard symbol may retrieve word variants: (( cover estimations algorithms ) or ( ((pose approximation) or (one approximation)) algorithms ))*.