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)
"waste processing algorithm" » "data processing algorithm" (Expand Search), "image processing algorithm" (Expand Search), "wood processing algorithm" (Expand Search)
"element rl algorithm" » "element rl algorithms" (Expand Search), "element rf algorithm" (Expand Search), "element ml algorithms" (Expand Search), "element ree algorithm" (Expand Search), "element ore algorithm" (Expand Search), "element _ algorithm" (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 ("waste processing algorithm"))) OR ("element rl algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"plant processing algorithm\") OR (\"waste processing algorithm\"))) OR (\"element rl algorithm\"))".
• Removing quotes may allow a broader search: (((( plant processing algorithm ) OR ( waste processing algorithm ))) OR ( element rl algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("plant processing algorithm") OR ("waste processing algorithm"))) OR ("element rl algorithm"))*.