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 pso algorithms" » "elements pso algorithm" (Expand Search), "elements two algorithms" (Expand Search), "elements ppo algorithm" (Expand Search), "elements ppm algorithms" (Expand Search), "elements upon algorithms" (Expand Search), "elements _ algorithms" (Expand Search)
"elements wt algorithms" » "elements art algorithms" (Expand Search), "elements two algorithms" (Expand Search), "elements ml algorithms" (Expand Search), "elements _ algorithms" (Expand Search), "elements b algorithms" (Expand Search), "elements fe algorithms" (Expand Search)

Try widening your search to All Fields.

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