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 forest algorithm" » "elements res algorithm" (Expand Search), "elements present algorithm" (Expand Search)
"recent study algorithm" » "recent wsindy algorithm" (Expand Search), "recent td3 algorithm" (Expand Search), "recent seu algorithm" (Expand Search), "present study algorithm" (Expand Search), "recent studies 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 forest algorithm") OR ("recent study algorithm"))) OR ("query processing algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"elements forest algorithm\") OR (\"recent study algorithm\"))) OR (\"query processing algorithm\"))".
• Removing quotes may allow a broader search: (((( elements forest algorithm ) OR ( recent study algorithm ))) OR ( query processing algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("elements forest algorithm") OR ("recent study algorithm"))) OR ("query processing algorithm"))*.