Perhaps you should try some spelling variations:
"client sampling algorithm" » "client scheduling algorithm" (Expand Search)
"elements wt algorithm" » "elements rd algorithm" (Expand Search), "elements _ algorithms" (Expand Search), "elements _ algorithm" (Expand Search)
"elements tree algorithms" » "elements three algorithms" (Expand Search), "elements free algorithms" (Expand Search)

Try widening your search to All Fields.

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