Perhaps you should try some spelling variations:
"element leiden algorithm" » "element learner algorithm" (Expand Search), "element kepler algorithm" (Expand Search), "element mean algorithm" (Expand Search)
"level coding algorithm" » "level cosine algorithm" (Expand Search), "level modeling algorithm" (Expand Search), "level finding algorithm" (Expand Search), "level according algorithm" (Expand Search), "level using algorithm" (Expand Search)
"element mesh algorithm" » "element best algorithm" (Expand Search), "element mean algorithm" (Expand Search), "element means algorithm" (Expand Search), "element method algorithm" (Expand Search), "elements mges algorithm" (Expand Search), "element te algorithm" (Expand Search)

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("element leiden algorithm") OR ((("element mesh algorithm") OR ("level coding algorithm"))))~.
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• Removing quotes may allow a broader search: (( element leiden algorithm ) OR ((( element mesh algorithm ) OR ( level coding algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("element leiden algorithm") OR ((("element mesh algorithm") OR ("level coding algorithm"))))*.