Perhaps you should try some spelling variations:
"modified invasive ventilation algorithms" » "modified invasive estimation algorithms", "modified invasive estimation algorithm", "modified invasive convolution algorithms", "modified adaptive ventilation algorithms", "modified passive ventilation algorithms"
"modified coverage approximation algorithms" » "modified average approximation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified invasive ventilation algorithms\") OR (\"modified coverage approximation algorithms\"))~".
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