Perhaps you should try some spelling variations:
"modified df optimization algorithms" » "modified df optimisation algorithm", "modified df estimation algorithms", "modified df estimation algorithm", "modified _ optimization algorithms", "modified qoe optimization algorithms", "modified _ optimisation algorithms", "modified adam optimization algorithms", "modified bi1 optimization algorithms"
"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.

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