Perhaps you should try some spelling variations:
"modified time approximation algorithm" » "modified time approximation algorithms", "modified one approximation algorithm", "modified _ approximation algorithm", "modified bi1 approximation algorithm", "modified male approximation algorithm"
"modified quadratic estimation algorithms" » "modified quadratic estimation algorithm", "modified quadratic optimization algorithms", "modified quadratic optimisation algorithm", "modified quantile estimation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified time approximation algorithm\") OR (\"modified quadratic estimation algorithms\"))~".
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