Perhaps you should try some spelling variations:
"forest modeling algorithm" » "forest making algorithm" (Expand Search), "forest model algorithm" (Expand Search), "forest models algorithm" (Expand Search)
"element method algorithm" » "element network algorithm" (Expand Search), "element means algorithm" (Expand Search), "element mean algorithm" (Expand Search)
"end clustering algorithm" » "gene clustering algorithm" (Expand Search), "means clustering algorithm" (Expand Search), "cell clustering algorithm" (Expand Search)

Try widening your search to All Fields.

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