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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"machine learning convolution algorithms\") OR (\"modified objective convolution algorithmssss\"))~".
• Removing quotes may allow a broader search: (( machine learning convolution algorithms ) OR ( modified objective convolution algorithmssss ))~.
• Adding a wildcard symbol may retrieve word variants: (("machine learning convolution algorithms") OR ("modified objective convolution algorithmssss"))*.