Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
ventilation algorithm » estimation algorithm, estimation algorithms, evolution algorithm
adaptive ventilation » adaptive quantization, invasive ventilation
seird approximation » time approximation, network approximation
modified adaptive » modified passive
modified seird » modified near

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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( modified seird approximation algorithm ) OR ( modified adaptive ventilation algorithm ))~".
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