Perhaps you should try some spelling variations:
"modified adaptive optimization algorithms" » "modified adaptive optimisation algorithm", "modified adaptive estimation algorithms", "modified adaptive estimation algorithm", "modified objective optimization algorithms", "modified adaptive quantization algorithms", "modified static optimization algorithms", "modified passive optimization algorithms"
"machine learning methods algorithm" » "machine nursing methods algorithm"

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