Perhaps you should try some spelling variations:
"element mapping algorithm" » "element sampling algorithm" (Expand Search), "element matching algorithm" (Expand Search), "element mining algorithm" (Expand Search), "elemental mapping algorithm" (Expand Search), "element modeling algorithm" (Expand Search)
"elemental pso algorithm" » "elemental iron algorithm" (Expand Search), "elemental xrd algorithm" (Expand Search), "elemental two algorithms" (Expand Search), "elemental _ algorithm" (Expand Search), "elemental new algorithm" (Expand Search)
"elemental rf algorithm" » "elemental xrd algorithm" (Expand Search), "elemental iron algorithm" (Expand Search), "elemental _ algorithm" (Expand Search), "elemental em algorithm" (Expand Search), "elemental ii 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 pso algorithm") OR ("elemental rf algorithm"))) OR ("element mapping algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"elemental pso algorithm\") OR (\"elemental rf algorithm\"))) OR (\"element mapping algorithm\"))".
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• Adding a wildcard symbol may retrieve word variants: (((("elemental pso algorithm") OR ("elemental rf algorithm"))) OR ("element mapping algorithm"))*.