Perhaps you should try some spelling variations:
"modified objective approximation algorithm" » "modified objective approximation algorithms"
"machine learning evolution algorithm" » "machine learning solution algorithm", "machine learning evolutionary algorithm", "machine learning convolution algorithms", "machine learning convolution algorithm", "machine learning emotion algorithm"

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