Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
optimization algorithm » optimization algorithms, estimation algorithm, estimation algorithms
qoe optimisation » qoe optimization, _ optimisation, game optimization
code » core
parameter » parameters

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