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 mean algorithm" » "elements means algorithm" (Expand Search), "elements new algorithm" (Expand Search), "elements each algorithm" (Expand Search), "elements mges algorithm" (Expand Search), "elements fe algorithm" (Expand Search), "elements ree algorithm" (Expand Search)
"element mesh algorithm" » "element best algorithm" (Expand Search), "element means algorithm" (Expand Search), "element best algorithms" (Expand Search), "element method algorithm" (Expand Search), "elements mges algorithm" (Expand Search), "element te 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 mean algorithm") OR ("element mesh algorithm"))) OR ("query processing algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"elements mean algorithm\") OR (\"element mesh algorithm\"))) OR (\"query processing algorithm\"))".
• Removing quotes may allow a broader search: (((( elements mean algorithm ) OR ( element mesh algorithm ))) OR ( query processing algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("elements mean algorithm") OR ("element mesh algorithm"))) OR ("query processing algorithm"))*.