Perhaps you should try some spelling variations:
"elemental mapping algorithm" » "elemental making algorithm" (Expand Search), "elemental mining algorithm" (Expand Search), "elemental learning algorithm" (Expand Search), "element mapping 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 mges algorithm" » "elements means algorithm" (Expand Search), "elements mogwo algorithm" (Expand Search), "elements magic algorithm" (Expand Search)

Try widening your search to All Fields.

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