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"

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 convolution algorithms") OR ("modified adaptive ventilation algorithms"))~.
• Removing quotes may allow a broader search: (( modified passive convolution algorithms ) or ( modified adaptive ventilation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified passive convolution algorithms") or ("modified adaptive ventilation algorithms"))*.