Perhaps you should try some spelling variations:
"text processing algorithm" » "text processing algorithms" (Expand Search)
"element mesh algorithm" » "element deer algorithm" (Expand Search), "element search algorithm" (Expand Search), "elements mesh 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.

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