Perhaps you should try some spelling variations:
"element sampling algorithm" » "element making algorithm" (Expand Search), "element modeling algorithm" (Expand Search), "element matching algorithm" (Expand Search), "sediment sampling algorithm" (Expand Search), "client sampling algorithm" (Expand Search), "element mapping algorithm" (Expand Search)
"element mining algorithm" » "element finding algorithm" (Expand Search), "element making algorithm" (Expand Search), "element training algorithms" (Expand Search), "element mapping algorithm" (Expand Search), "element bonding algorithm" (Expand Search), "element modeling algorithm" (Expand Search)
"element tree algorithms" » "element three algorithms" (Expand Search), "element art algorithms" (Expand Search), "element two algorithms" (Expand Search), "element ree algorithms" (Expand Search), "element te algorithms" (Expand Search), "element ore algorithms" (Expand Search)

Try widening your search to All Fields.

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