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

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified invasive ventilation algorithms") OR ("modified delphi convolution algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified invasive ventilation algorithms\") OR (\"modified delphi convolution algorithms\"))*".
• Removing quotes may allow a broader search: (( modified invasive ventilation algorithms ) OR ( modified delphi convolution algorithms ))*.