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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( 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 ))*.