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 algorithm" » "modified quadratic optimization algorithm", "modified quantile estimation algorithm"

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