Perhaps you should try some spelling variations:
"elements mapping algorithm" » "elements making algorithm" (Expand Search), "elements mining algorithm" (Expand Search), "elements learning algorithm" (Expand Search), "element mapping algorithm" (Expand Search), "elemental mapping algorithm" (Expand Search), "elements during algorithm" (Expand Search)
"element two algorithms" » "element ml algorithms" (Expand Search), "element _ algorithms" (Expand Search), "element art algorithms" (Expand Search), "element te algorithms" (Expand Search)
"element forest algorithm" » "element ore 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 two algorithms") OR ("element forest algorithm"))) OR ("elements mapping algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"element two algorithms\") OR (\"element forest algorithm\"))) OR (\"elements mapping algorithm\"))".
• Removing quotes may allow a broader search: (((( element two algorithms ) OR ( element forest algorithm ))) OR ( elements mapping algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("element two algorithms") OR ("element forest algorithm"))) OR ("elements mapping algorithm"))*.