Perhaps you should try some spelling variations:
"certified network approximation algorithm" » "certified network approximation algorithms", "verified network approximation algorithm"
"modified objective convolution algorithms" » "modified objective evolution algorithm", "modified objective solution algorithm"

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