Perhaps you should try some spelling variations:
"element mapping algorithms" » "element matching algorithms" (Expand Search), "element making algorithm" (Expand Search), "element pacing algorithms" (Expand Search), "elemental mapping algorithms" (Expand Search), "element modeling algorithms" (Expand Search), "argument mapping algorithms" (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 mesh algorithm") OR ((("element mapping algorithms") OR ("level coding algorithm"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"element mesh algorithm\") OR (((\"element mapping algorithms\") OR (\"level coding algorithm\"))))".
• Removing quotes may allow a broader search: (( element mesh algorithm ) OR ((( element mapping algorithms ) OR ( level coding algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("element mesh algorithm") OR ((("element mapping algorithms") OR ("level coding algorithm"))))*.