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

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