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 em algorithm" » "element new algorithm" (Expand Search), "element _ algorithm" (Expand Search), "element _ algorithms" (Expand Search), "element ree algorithm" (Expand Search), "element te algorithm" (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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