Perhaps you should try some spelling variations:
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
estimation algorithmss » estimation algorithms, estimation algorithm, optimization algorithms
parameters estimation » parameter estimation, parameter estimates, parameter optimization
df optimization » _ optimization, qoe optimization, _ optimisation
modified df » modified _, modified adam, modified bi1

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified parameters estimation algorithmss ) OR ( modified df optimization algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified parameters estimation algorithmss ) or ( modified df optimization algorithm ))*.