Perhaps you should try some spelling variations:
"experimental case algorithm" » "experimental data algorithm" (Expand Search), "experimental dataset algorithm" (Expand Search), "experimental model algorithm" (Expand Search), "experimental based algorithm" (Expand Search), "experimental rast algorithm" (Expand Search), "experimental pass 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 multi algorithm" » "element multiple algorithms" (Expand Search), "element custom algorithm" (Expand Search), "elements multi 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 multi algorithm") OR ("experimental case algorithm"))) OR ("level coding algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"element multi algorithm\") OR (\"experimental case algorithm\"))) OR (\"level coding algorithm\"))".
• Removing quotes may allow a broader search: (((( element multi algorithm ) OR ( experimental case algorithm ))) OR ( level coding algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("element multi algorithm") OR ("experimental case algorithm"))) OR ("level coding algorithm"))*.