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

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( same optimization algorithmss ) or ( parameter estimation algorithms ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( same optimization algorithmss ) OR ( parameter estimation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (( same optimization algorithmss ) or ( parameter estimation algorithms ))*.