Perhaps you should try some spelling variations:
"stool clustering algorithm" » "study clustering algorithm" (Expand Search), "som clustering algorithm" (Expand Search), "some clustering algorithm" (Expand Search)
"data making algorithm" » "data learning algorithm" (Expand Search), "data finding algorithm" (Expand Search), "data means algorithm" (Expand Search), "data backing algorithm" (Expand Search), "data mining algorithm" (Expand Search), "data tracking algorithm" (Expand Search)
"element data algorithm" » "element data algorithms" (Expand Search), "element update algorithm" (Expand Search), "element atlas algorithm" (Expand Search), "settlement data algorithm" (Expand Search), "relevant data algorithm" (Expand Search), "movement data 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 clustering algorithm") OR ("data making algorithm"))) OR ("element data algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"stool clustering algorithm\") OR (\"data making algorithm\"))) OR (\"element data algorithm\"))".
• Removing quotes may allow a broader search: (((( stool clustering algorithm ) OR ( data making algorithm ))) OR ( element data algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("stool clustering algorithm") OR ("data making algorithm"))) OR ("element data algorithm"))*.