Perhaps you should try some spelling variations:
"signal processing algorithm" » "signal routing algorithm" (Expand Search), "signal tracking algorithm" (Expand Search), "signal boosting algorithm" (Expand Search)
"post modeling algorithm" » "post making algorithm" (Expand Search), "best modeling algorithm" (Expand Search), "forest modeling algorithm" (Expand Search), "joint modeling algorithm" (Expand Search)
"element data algorithm" » "element data algorithms" (Expand Search), "element update algorithm" (Expand Search), "element atlas algorithm" (Expand Search), "settlement data algorithm" (Expand Search), "relevant data algorithm" (Expand Search), "movement data algorithm" (Expand Search)

Try widening your search to All Fields.

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