Perhaps you should try some spelling variations:
"signal processing algorithm" » "signal modeling algorithm" (Expand Search), "signal routing algorithm" (Expand Search), "signal tracking algorithm" (Expand Search)
"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 cnn algorithm" » "elements mean algorithm" (Expand Search), "elements _ algorithm" (Expand Search), "elements ii algorithm" (Expand Search), "elements crcy algorithm" (Expand Search), "elements ices algorithm" (Expand Search), "elements upon algorithm" (Expand Search)

Try widening your search to All Fields.

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