Perhaps you should try some spelling variations:
"stool processing algorithm" » "stool processing algorithms" (Expand Search), "signal processing algorithm" (Expand Search), "text processing algorithm" (Expand Search)
"element based algorithm" » "event based algorithm" (Expand Search)
"element ppo algorithm" » "element rd algorithm" (Expand Search), "elementi per algorithm" (Expand Search)

Try widening your search to All Fields.

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