Perhaps you should try some spelling variations:
"machine learning convolution algorithms" » "machine learning evolution algorithm", "machine learning solution algorithm"
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified notion approximation algorithms\") OR (\"machine learning convolution algorithms\"))~".
• Removing quotes may allow a broader search: (( modified notion approximation algorithms ) OR ( machine learning convolution algorithms ))~.
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