Perhaps you should try some spelling variations:
"element sampling algorithm" » "element scheduling algorithm" (Expand Search)
"elements rast algorithm" » "elements jaya algorithm" (Expand Search), "elements rd algorithm" (Expand Search)
"elements ppm algorithm" » "elements rd algorithm" (Expand Search), "elements _ algorithm" (Expand Search), "elementi per algorithm" (Expand Search)

Try widening your search to All Fields.

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