Perhaps you should try some spelling variations:
"modified rough approximation algorithm" » "modified rough approximation algorithms", "modified rough approximations algorithm", "modified one approximation algorithm"
"modified passive convolution algorithms" » "modified passive evolution algorithm", "modified passive solution algorithm", "modified adaptive convolution algorithms"

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