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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified adaptive ventilation algorithms\") OR (\"modified passive optimisation algorithm\"))~".
• Removing quotes may allow a broader search: (( modified adaptive ventilation algorithms ) OR ( modified passive optimisation algorithm ))~.
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