Perhaps you should try some spelling variations:
parameters estimation » parameter estimation, parameter estimates, parameter optimization
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
optimized algorithm » optimized algorithms, optimizer algorithms
df optimized » _ optimized, _ optimize
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 df optimized algorithm ) OR ( modified parameters estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified df optimized algorithm ) or ( modified parameters estimation algorithms ))*.