Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm
quantile optimisation » quantile estimation
estimation algorithms » estimation algorithm, optimization algorithms, approximation algorithms
modified quantile » modified adaptive
df estimation » _ estimation
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 quantile optimisation algorithm ) OR ( modified df estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified quantile optimisation algorithm ) or ( modified df estimation algorithms ))*.