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 upon algorithm" » "elements fusion algorithm" (Expand Search), "elements pso algorithm" (Expand Search), "elements mean algorithm" (Expand Search), "elements ppm algorithm" (Expand Search), "elements uce algorithm" (Expand Search), "complements upon algorithm" (Expand Search)
"elements ppo algorithm" » "elements pso algorithm" (Expand Search), "elements two algorithms" (Expand Search), "elements _ algorithm" (Expand Search), "elements ppm algorithm" (Expand Search), "elements b algorithm" (Expand Search)

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