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)
"elements forest algorithm" » "elements res algorithm" (Expand Search), "elements present algorithm" (Expand Search)
"complement low algorithm" » "complement _ algorithm" (Expand Search), "complement new algorithm" (Expand Search), "complement box algorithm" (Expand Search), "complement coa algorithm" (Expand Search)

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("elements forest algorithm") OR ("complement low algorithm"))) OR ("level coding algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"elements forest algorithm\") OR (\"complement low algorithm\"))) OR (\"level coding algorithm\"))".
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• Adding a wildcard symbol may retrieve word variants: (((("elements forest algorithm") OR ("complement low algorithm"))) OR ("level coding algorithm"))*.