Perhaps you should try some spelling variations:
"client sampling algorithm" » "client making algorithm" (Expand Search), "client modeling algorithm" (Expand Search), "client mining algorithm" (Expand Search)
"element tree algorithms" » "element three algorithms" (Expand Search), "element art algorithms" (Expand Search), "element two algorithms" (Expand Search), "element tnew algorithms" (Expand Search), "element trf algorithms" (Expand Search), "element trl algorithms" (Expand Search), "element te algorithms" (Expand Search), "element ore algorithms" (Expand Search), "elements ree algorithms" (Expand Search)
"element ree algorithm" » "element new algorithm" (Expand Search), "element rf algorithm" (Expand Search), "element rl algorithm" (Expand Search), "elements ree algorithm" (Expand Search), "elements res algorithm" (Expand Search), "element te 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 tree algorithms") OR ("element ree algorithm"))) OR ("client sampling algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"element tree algorithms\") OR (\"element ree algorithm\"))) OR (\"client sampling algorithm\"))".
• Removing quotes may allow a broader search: (((( element tree algorithms ) OR ( element ree algorithm ))) OR ( client sampling algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("element tree algorithms") OR ("element ree algorithm"))) OR ("client sampling algorithm"))*.