Perhaps you should try some spelling variations:
"reverse learning algorithm" » "reverse learning algorithms" (Expand Search), "remote learning algorithm" (Expand Search)
"neural coding algorithm" » "neural cosine algorithm" (Expand Search), "neural modeling algorithm" (Expand Search), "neural finding algorithm" (Expand Search)
"elements ppo algorithm" » "elements pso algorithm" (Expand Search), "elements two algorithms" (Expand Search), "elements _ algorithm" (Expand Search), "elements ppm algorithm" (Expand Search), "elements upon algorithm" (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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