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)
"complement box algorithm" » "complement low algorithm" (Expand Search), "complement _ algorithm" (Expand Search), "complement 5a algorithm" (Expand Search), "complement best algorithm" (Expand Search), "complement ii algorithm" (Expand Search)
"elements wold algorithm" » "elements rl algorithm" (Expand Search), "elements colony algorithm" (Expand Search), "elements wt algorithm" (Expand Search)

Try widening your search to All Fields.

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