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

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