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

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified passive ventilation algorithm") OR ("modified delphi convolution algorithms"))~.
• Removing quotes may allow a broader search: (( modified passive ventilation algorithm ) or ( modified delphi convolution algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified passive ventilation algorithm") or ("modified delphi convolution algorithms"))*.