Perhaps you should try some spelling variations:
"element sampling algorithm" » "element making algorithm" (Expand Search), "element mining algorithm" (Expand Search), "element matching algorithm" (Expand Search), "sediment sampling algorithm" (Expand Search), "client sampling algorithm" (Expand Search), "element mapping algorithm" (Expand Search)
"data modeling algorithm" » "data making algorithm" (Expand Search), "data modelling algorithm" (Expand Search), "data models algorithm" (Expand Search)
"elements box algorithm" » "elements best algorithm" (Expand Search), "elements _ algorithm" (Expand Search), "elements ii algorithm" (Expand Search), "elements b algorithm" (Expand Search), "elements upon 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 box algorithm") OR ((("element sampling algorithm") OR ("data modeling algorithm"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"elements box algorithm\") OR (((\"element sampling algorithm\") OR (\"data modeling algorithm\"))))".
• Removing quotes may allow a broader search: (( elements box algorithm ) OR ((( element sampling algorithm ) OR ( data modeling algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("elements box algorithm") OR ((("element sampling algorithm") OR ("data modeling algorithm"))))*.