Perhaps you should try some spelling variations:
"element swarm algorithm" » "element search algorithm" (Expand Search), "element software algorithm" (Expand Search)
"element eem algorithm" » "element em algorithm" (Expand Search), "element new algorithm" (Expand Search), "element svm algorithm" (Expand Search), "element te algorithm" (Expand Search), "element ree algorithm" (Expand Search), "element mesh algorithm" (Expand Search)
"element rf algorithm" » "element _ algorithm" (Expand Search), "element em algorithm" (Expand Search), "element ii algorithm" (Expand Search), "element ree algorithm" (Expand Search), "element ore 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 swarm algorithm") OR ((("element rf algorithm") OR ("element eem algorithm"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"element swarm algorithm\") OR (((\"element rf algorithm\") OR (\"element eem algorithm\"))))".
• Removing quotes may allow a broader search: (( element swarm algorithm ) OR ((( element rf algorithm ) OR ( element eem algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("element swarm algorithm") OR ((("element rf algorithm") OR ("element eem algorithm"))))*.