Perhaps you should try some spelling variations:
"modified a optimized algorithm" » "modified a optimized algorithms", "modified a optimizer algorithms", "modified _ optimized algorithm", "modified _ optimize algorithm", "modified df optimized algorithm", "modified adam optimized algorithm"
"modified adamdamdaptive estimation algorithm" » "modified _damdamdaptive estimation algorithm", "modified dfdamdamdaptive estimation algorithm", "modified adamdamdamdaptive estimation algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified a optimized algorithm\") OR (\"modified adamdamdaptive estimation algorithm\"))~".
• Removing quotes may allow a broader search: (( modified a optimized algorithm ) OR ( modified adamdamdaptive estimation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified a optimized algorithm") OR ("modified adamdamdaptive estimation algorithm"))*.