Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
parameters estimation » parameter estimation, parameter estimates, parameter optimization
optimized algorithms » optimized algorithm, optimizer algorithms, optimization 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( modified df optimized algorithms ) OR ( modified parameters estimation algorithms ))~".
• Adding a wildcard symbol may retrieve word variants: (( modified df optimized algorithms ) OR ( modified parameters estimation algorithms ))*.