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)
"element tree algorithms" » "element three algorithms" (Expand Search), "element art algorithms" (Expand Search), "element two algorithms" (Expand Search), "element ree algorithms" (Expand Search), "element te algorithms" (Expand Search), "element ore algorithms" (Expand Search)
"element trf algorithms" » "element art algorithms" (Expand Search), "element two algorithms" (Expand Search), "element rf algorithm" (Expand Search), "element te algorithms" (Expand Search), "element ore algorithms" (Expand Search), "element citre 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: (((("element tree algorithms") OR ("element trf algorithms"))) OR ("query processing algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"element tree algorithms\") OR (\"element trf algorithms\"))) OR (\"query processing algorithm\"))".
• Removing quotes may allow a broader search: (((( element tree algorithms ) OR ( element trf algorithms ))) OR ( query processing algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("element tree algorithms") OR ("element trf algorithms"))) OR ("query processing algorithm"))*.