Perhaps you should try some spelling variations:
"element clustering algorithm" » "seven clustering algorithm" (Expand Search), "different clustering algorithm" (Expand Search)
"element finding algorithm" » "element bonding algorithm" (Expand Search), "recent finding algorithm" (Expand Search), "present findings algorithm" (Expand Search)
"element rf algorithm" » "element _ algorithm" (Expand Search), "element ii algorithm" (Expand Search), "element art algorithms" (Expand Search), "element ore algorithm" (Expand Search), "element ree 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 rf algorithm") OR ((("element finding algorithm") OR ("element clustering algorithm"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"element rf algorithm\") OR (((\"element finding algorithm\") OR (\"element clustering algorithm\"))))".
• Removing quotes may allow a broader search: (( element rf algorithm ) OR ((( element finding algorithm ) OR ( element clustering algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("element rf algorithm") OR ((("element finding algorithm") OR ("element clustering algorithm"))))*.