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 counting methods algorithm" » "modified caging methods algorithm", "modified nursing methods algorithm", "modified control methods algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified counting methods algorithm\") OR (\"modified invasive ventilation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified counting methods algorithm ) OR ( modified invasive ventilation algorithms ))~.
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