Perhaps you should try some spelling variations:
"element sampling algorithm" » "element scheduling algorithm" (Expand Search), "elements sampling algorithm" (Expand Search)
"element ml algorithms" » "element _ algorithms" (Expand Search), "element rd algorithm" (Expand Search), "elements ml algorithms" (Expand Search)
"element tree algorithms" » "elements tree algorithms" (Expand Search), "element three algorithms" (Expand Search), "element free 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 sampling algorithm") OR ((("element tree algorithms") OR ("element ml algorithms"))))~.
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