Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
one approximation » time approximation, _ approximation, rough approximations
modified quantile » modified adaptive
modified one » modified male, modified near, modified orca

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 one approximation algorithm ) OR ( modified quantile estimation algorithms ))~".
• Adding a wildcard symbol may retrieve word variants: (( modified one approximation algorithm ) OR ( modified quantile estimation algorithms ))*.