Perhaps you should try some spelling variations:
"implement routine algorithm" » "implement cosine algorithm" (Expand Search)
"levels fusion algorithm" » "levels auction algorithm" (Expand Search), "levels cosine algorithm" (Expand Search), "level fusion algorithm" (Expand Search)
"element based algorithm" » "event based algorithm" (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 based algorithm") OR ((("implement routine algorithm") OR ("levels fusion algorithm"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"element based algorithm\") OR (((\"implement routine algorithm\") OR (\"levels fusion algorithm\"))))".
• Removing quotes may allow a broader search: (( element based algorithm ) OR ((( implement routine algorithm ) OR ( levels fusion algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("element based algorithm") OR ((("implement routine algorithm") OR ("levels fusion algorithm"))))*.