Perhaps you should try some spelling variations:
"query processing algorithm" » "query processing algorithms" (Expand Search), "text processing algorithm" (Expand Search)
"elements cnn algorithm" » "elements rd algorithm" (Expand Search), "elements colony algorithm" (Expand Search), "elements cosine algorithm" (Expand Search), "elements _ algorithm" (Expand Search)
"elements rf algorithm" » "elements rd algorithm" (Expand Search), "elements _ algorithms" (Expand Search), "elements _ algorithm" (Expand Search)

Try widening your search to All Fields.

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