Perhaps you should try some spelling variations:
"elements sampling algorithm" » "elements mining algorithm" (Expand Search), "sediment sampling algorithm" (Expand Search), "client sampling algorithm" (Expand Search)
"element mapping algorithm" » "element matching algorithm" (Expand Search), "element mining algorithm" (Expand Search), "element learning algorithm" (Expand Search), "elemental mapping algorithm" (Expand Search), "element modeling algorithm" (Expand Search)
"element ree algorithm" » "element tree algorithms" (Expand Search), "element new algorithm" (Expand Search), "element em algorithm" (Expand Search), "elements ree algorithm" (Expand Search), "element te algorithm" (Expand Search), "element mesh algorithm" (Expand Search)

Try widening your search to All Fields.

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