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 tree algorithms" » "element three algorithms" (Expand Search), "element other algorithms" (Expand Search), "element art algorithms" (Expand Search), "element ree algorithms" (Expand Search), "element te algorithms" (Expand Search), "elements ree algorithms" (Expand Search)
"element rl algorithms" » "element ml algorithms" (Expand Search), "element art algorithms" (Expand Search), "element all algorithms" (Expand Search), "element ree algorithms" (Expand Search), "element ore algorithms" (Expand Search), "element _ 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 sampling algorithm") OR ((("element rl algorithms") OR ("element tree algorithms"))))~.
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• Removing quotes may allow a broader search: (( element sampling algorithm ) OR ((( element rl algorithms ) OR ( element tree algorithms )))).
• Adding a wildcard symbol may retrieve word variants: (("element sampling algorithm") OR ((("element rl algorithms") OR ("element tree algorithms"))))*.