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)
"element ore algorithms" » "element tree algorithms" (Expand Search), "element art algorithms" (Expand Search), "element rl algorithms" (Expand Search), "element te algorithms" (Expand Search), "element ree algorithms" (Expand Search), "element model algorithms" (Expand Search)
"element rf algorithm" » "element _ algorithm" (Expand Search), "element em algorithm" (Expand Search), "element ii algorithm" (Expand Search), "element ree algorithm" (Expand Search), "element te algorithm" (Expand Search)

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