Perhaps you should try some spelling variations:
"current sampling algorithm" » "current scheduling algorithm" (Expand Search)
"neural coding algorithm" » "neural cosine algorithm" (Expand Search), "neural colony algorithm" (Expand Search), "neural scheduling algorithm" (Expand Search)
"represent sem algorithm" » "represent swarm algorithm" (Expand Search), "represent deer algorithm" (Expand Search), "represent rd algorithm" (Expand Search), "present sem algorithm" (Expand Search)

Try widening your search to All Fields.

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