Perhaps you should try some spelling variations:
"query processing algorithm" » "query processing algorithms" (Expand Search), "text processing algorithm" (Expand Search)
"relevant data algorithm" » "relevant jaya algorithm" (Expand Search), "relevant deer algorithm" (Expand Search)
"element tree algorithms" » "elements tree algorithms" (Expand Search), "element three algorithms" (Expand Search), "element free algorithms" (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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