Perhaps you should try some spelling variations:
"key modeling algorithm" » "key scheduling algorithm" (Expand Search), "_ modeling algorithm" (Expand Search)
"level coding algorithm" » "level cosine algorithm" (Expand Search), "level colony algorithm" (Expand Search), "level scheduling algorithm" (Expand Search)
"elements crcy algorithm" » "elements carlo algorithm" (Expand Search), "elements rd algorithm" (Expand Search), "elements search algorithm" (Expand Search)

Try widening your search to All Fields.

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