Perhaps you should try some spelling variations:
"post processing algorithm" » "post processing algorithms" (Expand Search), "text processing algorithm" (Expand Search)
"element best algorithm" » "element deer algorithm" (Expand Search), "elements best algorithm" (Expand Search)
"element mean algorithm" » "element deer algorithm" (Expand Search), "element search algorithm" (Expand Search), "elements mean 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 best algorithm") OR ("element mean algorithm"))) OR ("post processing algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"element best algorithm\") OR (\"element mean algorithm\"))) OR (\"post processing algorithm\"))".
• Removing quotes may allow a broader search: (((( element best algorithm ) OR ( element mean algorithm ))) OR ( post processing algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("element best algorithm") OR ("element mean algorithm"))) OR ("post processing algorithm"))*.