Perhaps you should try some spelling variations:
"element tracking algorithm" » "element tracking algorithms" (Expand Search), "element training algorithms" (Expand Search), "element making algorithm" (Expand Search), "movement tracking algorithm" (Expand Search), "sleep tracking algorithm" (Expand Search), "element strain algorithm" (Expand Search)
"element based algorithms" » "element based algorithm" (Expand Search), "engagement based algorithms" (Expand Search)
"element erf algorithm" » "element rf algorithm" (Expand Search), "element rl algorithm" (Expand Search), "element em algorithm" (Expand Search), "element ore algorithm" (Expand Search), "element mesh 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 tracking algorithm") OR ((("element erf algorithm") OR ("element based algorithms"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"element tracking algorithm\") OR (((\"element erf algorithm\") OR (\"element based algorithms\"))))".
• Removing quotes may allow a broader search: (( element tracking algorithm ) OR ((( element erf algorithm ) OR ( element based algorithms )))).
• Adding a wildcard symbol may retrieve word variants: (("element tracking algorithm") OR ((("element erf algorithm") OR ("element based algorithms"))))*.