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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified _ optimization algorithm") OR ("modified adaptive ventilation algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified _ optimization algorithm\") OR (\"modified adaptive ventilation algorithm\"))*".
• Removing quotes may allow a broader search: (( modified _ optimization algorithm ) OR ( modified adaptive ventilation algorithm ))*.