Perhaps you should try some spelling variations:
"element sampling algorithm" » "element mining algorithm" (Expand Search), "sediment sampling algorithm" (Expand Search), "element mapping algorithm" (Expand Search), "client sampling algorithm" (Expand Search)
"sleep processing algorithm" » "speech processing algorithm" (Expand Search), "level processing algorithm" (Expand Search), "salmon processing algorithm" (Expand Search)
"elements em algorithm" » "elements new algorithm" (Expand Search), "elements _ algorithm" (Expand Search), "elements _ algorithms" (Expand Search), "elements ree algorithm" (Expand Search), "elements ppm algorithm" (Expand Search), "elements res 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 em algorithm") OR ((("sleep processing algorithm") OR ("element sampling algorithm"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"elements em algorithm\") OR (((\"sleep processing algorithm\") OR (\"element sampling algorithm\"))))".
• Removing quotes may allow a broader search: (( elements em algorithm ) OR ((( sleep processing algorithm ) OR ( element sampling algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("elements em algorithm") OR ((("sleep processing algorithm") OR ("element sampling algorithm"))))*.