Perhaps you should try some spelling variations:
"element sampling algorithm" » "element mining algorithm" (Expand Search), "sediment sampling algorithm" (Expand Search), "element mapping algorithm" (Expand Search), "client sampling algorithm" (Expand Search)
"element ii algorithm" » "element _ algorithm" (Expand Search), "element em algorithm" (Expand Search), "element new algorithm" (Expand Search), "element te algorithm" (Expand Search), "element g algorithm" (Expand Search)
"elemental ddpg algorithm" » "elements ddpg algorithm" (Expand Search), "elemental ddp algorithm" (Expand Search), "elemental dpg algorithm" (Expand Search), "elemental dopg 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 ddpg algorithm") OR ("element ii algorithm"))) OR ("element sampling algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"elemental ddpg algorithm\") OR (\"element ii algorithm\"))) OR (\"element sampling algorithm\"))".
• Removing quotes may allow a broader search: (((( elemental ddpg algorithm ) OR ( element ii algorithm ))) OR ( element sampling algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("elemental ddpg algorithm") OR ("element ii algorithm"))) OR ("element sampling algorithm"))*.