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

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• Performing a fuzzy search may retrieve terms with similar spellings: (( modified passive ventilation algorithms ) OR ( modified policy optimisation algorithm ))~.
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