Perhaps you should try some spelling variations:
"client sampling algorithm" » "client mining algorithm" (Expand Search), "sediment sampling algorithm" (Expand Search)
"element ore algorithm" » "element rl algorithm" (Expand Search), "element erf algorithm" (Expand Search), "element lr algorithm" (Expand Search), "element te algorithm" (Expand Search), "element ree algorithm" (Expand Search), "element model 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 te algorithm" (Expand Search)

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("client sampling algorithm") OR ((("element ore algorithm") OR ("element rf algorithm"))))~.
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• Removing quotes may allow a broader search: (( client sampling algorithm ) OR ((( element ore algorithm ) OR ( element rf algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("client sampling algorithm") OR ((("element ore algorithm") OR ("element rf algorithm"))))*.