Perhaps you should try some spelling variations:
"query processing algorithm" » "query modeling algorithm" (Expand Search), "query routing algorithm" (Expand Search), "query tracking algorithm" (Expand Search), "pre processing algorithm" (Expand Search)
"elements tree algorithms" » "elements three algorithms" (Expand Search), "elements art algorithms" (Expand Search), "elements two algorithms" (Expand Search), "elements ree algorithms" (Expand Search), "element ree algorithms" (Expand Search), "elements res algorithms" (Expand Search)
"elements dbo algorithm" » "elements modbo algorithm" (Expand Search), "elements pso algorithm" (Expand Search), "elements box algorithm" (Expand Search), "elements b algorithm" (Expand Search), "elements upon algorithm" (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 dbo algorithm") OR ("elements tree algorithms"))) OR ("query processing algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"elements dbo algorithm\") OR (\"elements tree algorithms\"))) OR (\"query processing algorithm\"))".
• Removing quotes may allow a broader search: (((( elements dbo algorithm ) OR ( elements tree algorithms ))) OR ( query processing algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("elements dbo algorithm") OR ("elements tree algorithms"))) OR ("query processing algorithm"))*.