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)
"experiments show algorithm" » "experiments showed algorithm" (Expand Search), "experiments _ algorithm" (Expand Search), "experiments new algorithm" (Expand Search), "experiments pso algorithm" (Expand Search), "experiments box algorithm" (Expand Search)
"neural coding algorithm" » "neural cosine algorithm" (Expand Search), "neural modeling algorithm" (Expand Search), "neural finding 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 ("experiments show algorithm"))) OR ("neural coding algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"complex system algorithm\") OR (\"experiments show algorithm\"))) OR (\"neural coding algorithm\"))".
• Removing quotes may allow a broader search: (((( complex system algorithm ) OR ( experiments show algorithm ))) OR ( neural coding algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("complex system algorithm") OR ("experiments show algorithm"))) OR ("neural coding algorithm"))*.