Perhaps you should try some spelling variations:
"elements sampling algorithm" » "elements scheduling algorithm" (Expand Search)
"elemental xrd algorithm" » "elemental rd algorithm" (Expand Search), "elementary xrd algorithm" (Expand Search), "element xrd algorithm" (Expand Search)
"elemental rl algorithms" » "elemental _ algorithms" (Expand Search), "elemental rd algorithm" (Expand Search), "elementary rl algorithms" (Expand Search), "element rl algorithms" (Expand Search)

Try widening your search to All Fields.

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