Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
optimized algorithms » optimized algorithm, optimizer algorithms, optimization algorithms
modified quantile » modified adaptive
df optimized » _ optimized, _ optimize
modified df » modified _, modified adam, modified bi1

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

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