Perhaps you should try some spelling variations:
"element tree algorithms" » "element three algorithms" (Expand Search), "element other algorithms" (Expand Search), "element art algorithms" (Expand Search), "element tthree algorithms" (Expand Search), "element trl algorithms" (Expand Search), "element tde algorithms" (Expand Search), "element te algorithms" (Expand Search), "elements ree algorithms" (Expand Search), "element ore algorithms" (Expand Search)
"wood processing algorithm" » "food processing algorithm" (Expand Search)
"element ree algorithms" » "element three algorithms" (Expand Search), "element rl algorithms" (Expand Search), "element de algorithms" (Expand Search), "elements ree algorithms" (Expand Search), "element te algorithms" (Expand Search), "element mesh 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 tree algorithms") OR ("element ree algorithms"))) OR ("wood processing algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"element tree algorithms\") OR (\"element ree algorithms\"))) OR (\"wood processing algorithm\"))".
• Removing quotes may allow a broader search: (((( element tree algorithms ) OR ( element ree algorithms ))) OR ( wood processing algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("element tree algorithms") OR ("element ree algorithms"))) OR ("wood processing algorithm"))*.