Perhaps you should try some spelling variations:
"element sampling algorithm" » "element mining algorithm" (Expand Search), "sediment sampling algorithm" (Expand Search), "element mapping algorithm" (Expand Search), "client sampling algorithm" (Expand Search)
"elements rast algorithm" » "elements best algorithm" (Expand Search), "elements pass algorithm" (Expand Search), "elements forest algorithm" (Expand Search), "elements res algorithm" (Expand Search), "elements based algorithm" (Expand Search), "elements ree algorithm" (Expand Search)
"elements pso algorithm" » "elements two algorithms" (Expand Search), "elements _ algorithm" (Expand Search), "elements new algorithm" (Expand Search), "elements ppm algorithm" (Expand Search), "elements upon algorithm" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("elements pso algorithm") OR ("elements rast algorithm"))) OR ("element sampling algorithm"))~.
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• Removing quotes may allow a broader search: (((( elements pso algorithm ) OR ( elements rast algorithm ))) OR ( element sampling algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("elements pso algorithm") OR ("elements rast algorithm"))) OR ("element sampling algorithm"))*.