Perhaps you should try some spelling variations:
"level coding algorithm" » "level cosine algorithm" (Expand Search), "level colony algorithm" (Expand Search), "level scheduling algorithm" (Expand Search)
"complement cc3d algorithm" » "complement rd algorithm" (Expand Search), "implement cc3d algorithm" (Expand Search), "complementary cc3d algorithm" (Expand Search)
"select control algorithm" » "selected control 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 cc3d algorithm") OR ("select control algorithm"))) OR ("level coding algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"complement cc3d algorithm\") OR (\"select control algorithm\"))) OR (\"level coding algorithm\"))".
• Removing quotes may allow a broader search: (((( complement cc3d algorithm ) OR ( select control algorithm ))) OR ( level coding algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("complement cc3d algorithm") OR ("select control algorithm"))) OR ("level coding algorithm"))*.