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 four algorithms" » "complement low algorithms" (Expand Search)
"elements cc3d algorithm" » "elements cscap algorithm" (Expand Search), "elements cnn algorithm" (Expand Search), "elements wold algorithm" (Expand Search), "elements crcy algorithm" (Expand Search), "elements ices algorithm" (Expand Search), "elements uce 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 four algorithms") OR ("elements cc3d algorithm"))) OR ("level coding algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"complement four algorithms\") OR (\"elements cc3d algorithm\"))) OR (\"level coding algorithm\"))".
• Removing quotes may allow a broader search: (((( complement four algorithms ) OR ( elements cc3d algorithm ))) OR ( level coding algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("complement four algorithms") OR ("elements cc3d algorithm"))) OR ("level coding algorithm"))*.