Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithm, optimized algorithms
estimation algorithms » estimation algorithm, optimisation algorithm, approximation algorithms
pose optimization » qoe optimization, game optimization, response optimization
risk estimation » pose estimation

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• Performing a fuzzy search may retrieve terms with similar spellings: (( pose optimization algorithms ) or ( risk estimation algorithms ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( pose optimization algorithms ) OR ( risk estimation algorithms )).
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