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 upon algorithms" » "elements using algorithms" (Expand Search), "elements two algorithms" (Expand Search), "elements nn algorithms" (Expand Search), "elements ppm algorithms" (Expand Search), "elements uce algorithms" (Expand Search), "complements upon algorithms" (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 _ algorithms" (Expand Search), "elements b 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 upon algorithms") OR ("elements pso algorithms"))) OR ("element sampling algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"elements upon algorithms\") OR (\"elements pso algorithms\"))) OR (\"element sampling algorithm\"))".
• Removing quotes may allow a broader search: (((( elements upon algorithms ) OR ( elements pso algorithms ))) OR ( element sampling algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("elements upon algorithms") OR ("elements pso algorithms"))) OR ("element sampling algorithm"))*.