Perhaps you should try some spelling variations:
"waste processing algorithm" » "data processing algorithm" (Expand Search), "image processing algorithm" (Expand Search), "wood processing algorithm" (Expand Search)
"element tree algorithms" » "element three algorithms" (Expand Search), "element other algorithms" (Expand Search), "element art algorithms" (Expand Search), "element ree algorithms" (Expand Search), "element te algorithms" (Expand Search), "elements ree algorithms" (Expand Search)
"element forest algorithm" » "element ore algorithm" (Expand Search)

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