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)
"elements best algorithm" » "elements forest algorithm" (Expand Search), "elements based algorithm" (Expand Search), "elements new algorithm" (Expand Search), "elements res algorithm" (Expand Search), "elements b algorithm" (Expand Search)
"element mesh algorithm" » "element mean algorithm" (Expand Search), "element means algorithm" (Expand Search), "element best algorithms" (Expand Search), "element method algorithm" (Expand Search)

Try widening your search to All Fields.

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