Perhaps you should try some spelling variations:
"modified _ optimization algorithms" » "modified _ optimisation algorithm", "modified _ estimation algorithms", "modified _ estimation algorithm"
"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"

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