Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithm, optimized algorithms
estimation algorithms » estimation algorithm, optimisation algorithm, approximation algorithms
parameter estimation » parameter estimates, parameter optimization
qoe optimization » game optimization, _ optimization, stage optimization
modified qoe » modified male, modified _, modified bi1

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