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 ree algorithms" » "element tree algorithms" (Expand Search), "element three algorithms" (Expand Search), "element rl algorithms" (Expand Search), "elements ree algorithms" (Expand Search), "element te algorithms" (Expand Search), "element mesh algorithms" (Expand Search)
"element rf algorithm" » "element _ algorithm" (Expand Search), "element em algorithm" (Expand Search), "element ii algorithm" (Expand Search), "element ore algorithm" (Expand Search), "element te 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 ree algorithms") OR ("element rf algorithm"))) OR ("plant processing algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"element ree algorithms\") OR (\"element rf algorithm\"))) OR (\"plant processing algorithm\"))".
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• Adding a wildcard symbol may retrieve word variants: (((("element ree algorithms") OR ("element rf algorithm"))) OR ("plant processing algorithm"))*.