Perhaps you should try some spelling variations:
"plant processing algorithm" » "post processing algorithm" (Expand Search), "image processing algorithm" (Expand Search), "data processing algorithm" (Expand Search)
"element tree algorithms" » "element three algorithms" (Expand Search), "element other algorithms" (Expand Search), "element two algorithms" (Expand Search), "element ree algorithms" (Expand Search), "element te algorithms" (Expand Search), "elements ree algorithms" (Expand Search)
"elements art algorithms" » "elements _ algorithms" (Expand Search), "elements ml algorithms" (Expand Search), "elements based algorithms" (Expand Search), "elements wt algorithms" (Expand Search), "elements zr algorithms" (Expand Search), "elements crcy algorithms" (Expand Search)

Try widening your search to All Fields.

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