Perhaps you should try some spelling variations:
"led optimization algorithm" » "lead optimization algorithm" (Expand Search), "yet optimization algorithm" (Expand Search), "based optimization algorithm" (Expand Search)
"neural coding algorithm" » "neural cosine algorithm" (Expand Search), "neural modeling algorithm" (Expand Search), "neural finding algorithm" (Expand Search)
"element data algorithm" » "element data algorithms" (Expand Search), "element update algorithm" (Expand Search), "element atlas algorithm" (Expand Search), "settlement data algorithm" (Expand Search), "relevant data algorithm" (Expand Search), "movement data algorithm" (Expand Search)

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("element data algorithm") OR ((("led optimization algorithm") OR ("neural coding algorithm"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"element data algorithm\") OR (((\"led optimization algorithm\") OR (\"neural coding algorithm\"))))".
• Removing quotes may allow a broader search: (( element data algorithm ) OR ((( led optimization algorithm ) OR ( neural coding algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("element data algorithm") OR ((("led optimization algorithm") OR ("neural coding algorithm"))))*.