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)
"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)
"elements magic algorithm" » "elements making algorithm" (Expand Search), "elements mogwo algorithm" (Expand Search), "elements fastica algorithm" (Expand Search), "elements mges 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 ("elements magic algorithm"))) OR ("level coding algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"complement system algorithm\") OR (\"elements magic algorithm\"))) OR (\"level coding algorithm\"))".
• Removing quotes may allow a broader search: (((( complement system algorithm ) OR ( elements magic algorithm ))) OR ( level coding algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("complement system algorithm") OR ("elements magic algorithm"))) OR ("level coding algorithm"))*.