Perhaps you should try some spelling variations:
"sleep tracking algorithm" » "sleep learning algorithm" (Expand Search), "sleep processing algorithm" (Expand Search)
"elements cnn algorithm" » "elements _ algorithm" (Expand Search), "elements new algorithm" (Expand Search), "elements em algorithm" (Expand Search), "elements ices algorithm" (Expand Search), "elements upon algorithm" (Expand Search), "elements crcy algorithm" (Expand Search)
"elements wt algorithm" » "elements _ algorithm" (Expand Search), "elements em algorithm" (Expand Search), "elements ii algorithm" (Expand Search), "elements b algorithm" (Expand Search), "elements ree algorithm" (Expand Search)

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("elements cnn algorithm") OR ("elements wt algorithm"))) OR ("sleep tracking algorithm"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("elements cnn algorithm") OR ("elements wt algorithm"))) OR ("sleep tracking algorithm"))*.