Perhaps you should try some spelling variations:
"data processing algorithm" » "data processing algorithms" (Expand Search)
"element data algorithms" » "element jaya algorithm" (Expand Search), "elements data algorithms" (Expand Search)
"levels tree algorithms" » "level tree algorithms" (Expand Search), "levels three algorithms" (Expand Search), "levels 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: (("data processing algorithm") OR ((("levels tree algorithms") OR ("element data algorithms"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"data processing algorithm\") OR (((\"levels tree algorithms\") OR (\"element data algorithms\"))))".
• Removing quotes may allow a broader search: (( data processing algorithm ) OR ((( levels tree algorithms ) OR ( element data algorithms )))).
• Adding a wildcard symbol may retrieve word variants: (("data processing algorithm") OR ((("levels tree algorithms") OR ("element data algorithms"))))*.