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 each algorithm" » "elements search algorithm" (Expand Search), "elements means algorithm" (Expand Search), "elements crcy algorithm" (Expand Search), "elements uce algorithm" (Expand Search), "experiments each algorithm" (Expand Search)
"elements ppo algorithm" » "elements pso algorithm" (Expand Search), "elements two algorithms" (Expand Search), "elements _ 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 ppo algorithm") OR ((("element sampling algorithm") OR ("elements each algorithm"))))~.
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• Removing quotes may allow a broader search: (( elements ppo algorithm ) OR ((( element sampling algorithm ) OR ( elements each algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("elements ppo algorithm") OR ((("element sampling algorithm") OR ("elements each algorithm"))))*.