Perhaps you should try some spelling variations:
"modified learning convolution algorithms" » "modified learning evolution algorithm", "modified learning solution algorithm", "mobile learning convolution algorithms", "modified caging convolution algorithms"
"defined network approximation algorithms" » "designed network approximation algorithms"

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