Perhaps you should try some spelling variations:
"modified quantile optimization algorithms" » "modified quantile optimisation algorithm", "modified quantile estimation algorithms", "modified quantile optimized algorithms", "modified quadratic optimization algorithms", "modified static optimization algorithms", "modified adaptive optimization algorithms"
"modified pulses estimation algorithm" » "modified pose estimation algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified quantile optimization algorithms\") OR (\"modified pulses estimation algorithm\"))~".
• Removing quotes may allow a broader search: (( modified quantile optimization algorithms ) OR ( modified pulses estimation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified quantile optimization algorithms") OR ("modified pulses estimation algorithm"))*.