Perhaps you should try some spelling variations:
"complex systems algorithm" » "complex systematic algorithm" (Expand Search), "complex custom algorithm" (Expand Search), "complex sssgm algorithm" (Expand Search)
"neural coding algorithm" » "neural cosine algorithm" (Expand Search), "neural modeling algorithm" (Expand Search), "neural finding algorithm" (Expand Search)
"elements upon algorithm" » "elements ppo algorithm" (Expand Search), "elements fusion algorithm" (Expand Search), "elements pso algorithm" (Expand Search), "elements ppm algorithm" (Expand Search), "elements uce algorithm" (Expand Search), "complements upon 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 upon algorithm") OR ((("complex systems algorithm") OR ("neural coding algorithm"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"elements upon algorithm\") OR (((\"complex systems algorithm\") OR (\"neural coding algorithm\"))))".
• Removing quotes may allow a broader search: (( elements upon algorithm ) OR ((( complex systems algorithm ) OR ( neural coding algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("elements upon algorithm") OR ((("complex systems algorithm") OR ("neural coding algorithm"))))*.