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