Perhaps you should try some spelling variations:
"complex system algorithm" » "complex swarm algorithm" (Expand Search), "complaint system algorithm" (Expand Search)
"element making algorithm" » "element cosine algorithm" (Expand Search), "elements making algorithm" (Expand Search)
"level coding algorithm" » "level cosine algorithm" (Expand Search), "level colony algorithm" (Expand Search), "level scheduling 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 ("element making algorithm"))) OR ("level coding algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"complex system algorithm\") OR (\"element making algorithm\"))) OR (\"level coding algorithm\"))".
• Removing quotes may allow a broader search: (((( complex system algorithm ) OR ( element making algorithm ))) OR ( level coding algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("complex system algorithm") OR ("element making algorithm"))) OR ("level coding algorithm"))*.