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

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified quantile estimation algorithms") or ("modified invasive approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified quantile estimation algorithms") OR ("modified invasive approximation algorithms"))*.
• Removing quotes may allow a broader search: (( modified quantile estimation algorithms ) or ( modified invasive approximation algorithms ))*.