Perhaps you should try some spelling variations:
"engagement based algorithm" » "management based algorithm" (Expand Search), "fragment based algorithm" (Expand Search), "engagement model algorithm" (Expand Search)
"neural coding algorithm" » "neural cosine algorithm" (Expand Search), "neural modeling algorithm" (Expand Search), "neural finding algorithm" (Expand Search)
"element study algorithm" » "element wsindy algorithm" (Expand Search), "element td3 algorithm" (Expand Search), "element seu algorithm" (Expand Search), "relevant study algorithm" (Expand Search), "present study algorithm" (Expand Search), "recent study algorithm" (Expand Search)

Try widening your search to All Fields.

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