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

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• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((poses approximation) OR (one approximation)) algorithms ) OR ( pose optimisation algorithm )).
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