Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
market optimization » game optimization, parameter optimization, market capitalization
sphere optimisation » sphere estimation
qoe optimization » game optimization, _ optimization, stage optimization

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