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

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• Performing a fuzzy search may retrieve terms with similar spellings: (( pose optimisation algorithm ) or ( ((rough approximation) OR (one approximation)) algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( pose optimisation algorithm ) OR ( ((rough approximation) OR (one approximation)) algorithm )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( pose optimisation algorithm ) or ( ((rough approximation) OR (one approximation)) algorithm ))".
• Adding a wildcard symbol may retrieve word variants: (( pose optimisation algorithm ) or ( ((rough approximation) OR (one approximation)) algorithm ))*.