Perhaps you should try some spelling variations:
"movement tracking algorithm" » "movement learning algorithm" (Expand Search), "movement processing algorithm" (Expand Search)
"elements ppo algorithm" » "elements pso algorithm" (Expand Search), "elements pso algorithms" (Expand Search), "elements two algorithms" (Expand Search), "elements ppm algorithm" (Expand Search), "elements upon algorithm" (Expand Search), "elements _ 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)

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("elements ppo algorithm") OR ("elements cnn algorithm"))) OR ("movement tracking algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"elements ppo algorithm\") OR (\"elements cnn algorithm\"))) OR (\"movement tracking algorithm\"))".
• Removing quotes may allow a broader search: (((( elements ppo algorithm ) OR ( elements cnn algorithm ))) OR ( movement tracking algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("elements ppo algorithm") OR ("elements cnn algorithm"))) OR ("movement tracking algorithm"))*.