Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
ventilation algorithms » estimation algorithms, estimation algorithm, convolution algorithms
adaptive ventilation » adaptive quantization, invasive ventilation
one approximation » time approximation, _ approximation, rough approximations
modified adaptive » modified passive
modified one » modified male, modified near, modified orca

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• Performing a fuzzy search may retrieve terms with similar spellings: (( modified one approximation algorithm ) or ( modified adaptive ventilation algorithms ))~.
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