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 new algorithm" » "elemental deer algorithm" (Expand Search), "elemental rd algorithm" (Expand Search), "elementary new algorithm" (Expand Search), "element new algorithm" (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 new algorithm"))) OR ("elements sampling algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"elemental xrd algorithm\") OR (\"elemental new algorithm\"))) OR (\"elements sampling algorithm\"))".
• Removing quotes may allow a broader search: (((( elemental xrd algorithm ) OR ( elemental new algorithm ))) OR ( elements sampling algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("elemental xrd algorithm") OR ("elemental new algorithm"))) OR ("elements sampling algorithm"))*.