Perhaps you should try some spelling variations:
"element mapping algorithm" » "element sampling algorithm" (Expand Search), "element matching algorithm" (Expand Search), "element learning algorithm" (Expand Search), "elemental mapping algorithm" (Expand Search), "element modeling algorithm" (Expand Search)
"element mining algorithm" » "element learning algorithm" (Expand Search), "element means algorithm" (Expand Search), "element bonding algorithm" (Expand Search), "element modeling algorithm" (Expand Search)
"present tree algorithms" » "present three algorithms" (Expand Search), "present other algorithms" (Expand Search), "present art algorithms" (Expand Search), "present free algorithms" (Expand Search), "present cryo algorithms" (Expand Search), "present tab algorithms" (Expand Search)

Try widening your search to All Fields.

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