Perhaps you should try some spelling variations:
"complement system algorithm" » "component system algorithm" (Expand Search), "complex system algorithm" (Expand Search), "complement custom algorithm" (Expand Search), "complement sssgm algorithm" (Expand Search), "complement systematic algorithm" (Expand Search)
"neural coding algorithm" » "neural cosine algorithm" (Expand Search), "neural modeling algorithm" (Expand Search), "neural finding algorithm" (Expand Search)
"second model algorithm" » "second novel algorithm" (Expand Search), "second modbo algorithm" (Expand Search), "second modeling algorithm" (Expand Search), "second module algorithm" (Expand Search), "second order algorithm" (Expand Search), "second dose algorithm" (Expand Search)

Try widening your search to All Fields.

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