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

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