Perhaps you should try some spelling variations:
"complex system algorithm" » "complex sssgm algorithm" (Expand Search), "complex systematic algorithm" (Expand Search), "complex tested algorithms" (Expand Search), "complex systems algorithm" (Expand Search)
"elements custom algorithm" » "elements fusion algorithm" (Expand Search), "elements control algorithm" (Expand Search), "elements lasso algorithm" (Expand Search)
"level coding algorithm" » "level cosine algorithm" (Expand Search), "level modeling algorithm" (Expand Search), "level finding algorithm" (Expand Search), "level according algorithm" (Expand Search), "level using 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 custom algorithm"))) OR ("level coding algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"complex system algorithm\") OR (\"elements custom algorithm\"))) OR (\"level coding algorithm\"))".
• Removing quotes may allow a broader search: (((( complex system algorithm ) OR ( elements custom algorithm ))) OR ( level coding algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("complex system algorithm") OR ("elements custom algorithm"))) OR ("level coding algorithm"))*.