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

You may be able to get more results by adjusting your search query.

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