Perhaps you should try some spelling variations:
"complex system algorithm" » "complex custom algorithm" (Expand Search), "complex sssgm algorithm" (Expand Search), "complex systematic algorithm" (Expand Search), "complex systems algorithm" (Expand Search)
"neural coding algorithm" » "neural cosine algorithm" (Expand Search), "neural modeling algorithm" (Expand Search), "neural finding algorithm" (Expand Search)
"elements ree algorithm" » "elements tree algorithms" (Expand Search), "elements new algorithm" (Expand Search), "elements rf algorithm" (Expand Search), "element ree algorithm" (Expand Search), "elements res algorithm" (Expand Search), "elements fe algorithm" (Expand Search)

Try widening your search to All Fields.

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