Perhaps you should try some spelling variations:
"elemental mapping algorithm" » "elemental sampling algorithm" (Expand Search), "elemental matching algorithm" (Expand Search), "elemental mining algorithm" (Expand Search)
"element tree algorithms" » "element three algorithms" (Expand Search), "element other algorithms" (Expand Search), "element art algorithms" (Expand Search), "element ree algorithms" (Expand Search), "element te algorithms" (Expand Search), "elements ree algorithms" (Expand Search)
"element data algorithm" » "element data algorithms" (Expand Search), "element update algorithm" (Expand Search), "element each algorithm" (Expand Search), "relevant data algorithm" (Expand Search), "movement data algorithm" (Expand Search), "present data algorithm" (Expand Search)

Try widening your search to All Fields.

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