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