Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"machine learning convolution algorithm" » "machine learning convolution algorithms", "machine learning evolution algorithm", "machine learning solution algorithm"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("machine learning convolution algorithm") OR ("modified multiobjective estimation algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"machine learning convolution algorithm\") OR (\"modified multiobjective estimation algorithm\"))".
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