Perhaps you should try some spelling variations:
"stool processing algorithm" » "stool modeling algorithm" (Expand Search), "stool routing algorithm" (Expand Search), "stool tracking algorithm" (Expand Search), "wood processing algorithm" (Expand Search), "food processing algorithm" (Expand Search), "signal processing algorithm" (Expand Search)
"element based algorithm" » "engagement based algorithm" (Expand Search)
"element ppo algorithm" » "element pso algorithm" (Expand Search), "element two algorithms" (Expand Search), "element _ algorithm" (Expand Search), "elements ppm algorithm" (Expand Search), "elements upon 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"))))*.