Perhaps you should try some spelling variations:
"element sampling algorithm" » "element making algorithm" (Expand Search), "element modeling algorithm" (Expand Search), "element mining algorithm" (Expand Search), "sediment sampling algorithm" (Expand Search), "client sampling algorithm" (Expand Search), "element mapping algorithm" (Expand Search)
"elements based algorithms" » "elements based algorithm" (Expand Search), "experiments based algorithms" (Expand Search), "elements related algorithms" (Expand Search)
"elements ppm algorithm" » "elements ppo algorithm" (Expand Search), "elements pso algorithm" (Expand Search), "elements em algorithm" (Expand Search), "elements _ algorithm" (Expand Search), "elements b algorithm" (Expand Search), "elements fe algorithm" (Expand Search)

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