Perhaps you should try some spelling variations:
"based sampling algorithm" » "based making algorithm" (Expand Search), "based modeling algorithm" (Expand Search), "based mining algorithm" (Expand Search)
"element method algorithm" » "element network algorithm" (Expand Search), "element means algorithm" (Expand Search), "element mean algorithm" (Expand Search)
"element data algorithms" » "element art algorithms" (Expand Search), "element all algorithms" (Expand Search), "element both algorithms" (Expand Search), "settlement data algorithms" (Expand Search), "relevant data algorithms" (Expand Search), "movement data algorithms" (Expand Search)

Try widening your search to All Fields.

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