Perhaps you should try some spelling variations:
"modified quantile approximation algorithms" » "modified time approximation algorithms", "modified diophantine approximation algorithms", "modified adaptive approximation algorithms"
"modified quadratic estimation algorithms" » "modified quadratic estimation algorithm", "modified quadratic optimization algorithms", "modified quadratic optimisation algorithm", "modified quantile estimation algorithms"

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 quadratic estimation algorithms") OR ("modified quantile approximation algorithms"))~.
• Removing quotes may allow a broader search: (( modified quadratic estimation algorithms ) or ( modified quantile approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified quadratic estimation algorithms") or ("modified quantile approximation algorithms"))*.