Perhaps you should try some spelling variations:
"client sampling algorithm" » "client making algorithm" (Expand Search), "client modeling algorithm" (Expand Search), "client mining algorithm" (Expand Search)
"element ddpg algorithm" » "element ppo algorithm" (Expand Search), "element dbo algorithm" (Expand Search), "element hip algorithm" (Expand Search), "element g algorithm" (Expand Search), "element data algorithm" (Expand Search)
"elemental ii algorithm" » "elemental iron algorithm" (Expand Search), "elemental zinc algorithm" (Expand Search), "elemental xrd algorithm" (Expand Search), "elemental _ algorithm" (Expand Search), "elemental _ algorithms" (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 ("element ddpg algorithm"))) OR ("client sampling algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"elemental ii algorithm\") OR (\"element ddpg algorithm\"))) OR (\"client sampling algorithm\"))".
• Removing quotes may allow a broader search: (((( elemental ii algorithm ) OR ( element ddpg algorithm ))) OR ( client sampling algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("elemental ii algorithm") OR ("element ddpg algorithm"))) OR ("client sampling algorithm"))*.