Perhaps you should try some spelling variations:
"afm modeling algorithm" » "afm making algorithm" (Expand Search), "a modeling algorithm" (Expand Search), "ann modeling algorithm" (Expand Search), "dft modeling algorithm" (Expand Search)
"element method algorithm" » "element network algorithm" (Expand Search), "element means algorithm" (Expand Search), "element mean algorithm" (Expand Search)
"elements tree algorithms" » "elements three algorithms" (Expand Search), "elements art algorithms" (Expand Search), "elements two algorithms" (Expand Search), "elements ree algorithms" (Expand Search), "element ree algorithms" (Expand Search), "elements res algorithms" (Expand Search)

Try widening your search to All Fields.

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