Perhaps you should try some spelling variations:
"elemental ii algorithm" » "elemental rd algorithm" (Expand Search), "elemental _ algorithms" (Expand Search), "elementary ii algorithm" (Expand Search), "elements ii algorithm" (Expand Search), "elementsal ii algorithm" (Expand Search)
"elemental pso algorithm" » "elementary pso algorithm" (Expand Search), "elements pso algorithm" (Expand Search), "elementsal pso algorithm" (Expand Search)
"element matching algorithm" » "elements matching algorithm" (Expand Search), "element machine algorithm" (Expand Search)

Try widening your search to All Fields.

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