Perhaps you should try some spelling variations:
"modified adaptive ventilation algorithms" » "modified adaptive estimation algorithms", "modified adaptive estimation algorithm", "modified adaptive quantization algorithms", "modified invasive ventilation algorithms"
"modified passive convolution algorithms" » "modified passive evolution algorithm", "modified passive solution algorithm"

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