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

Try widening your search to All Fields.

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

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