Perhaps you should try some spelling variations:
"client sampling algorithm" » "client mining algorithm" (Expand Search), "sediment sampling algorithm" (Expand Search)
"client needs algorithm" » "client means algorithm" (Expand Search), "client new algorithm" (Expand Search), "client leiden algorithm" (Expand Search), "urgent needs algorithm" (Expand Search)
"china needs algorithm" » "china means algorithm" (Expand Search), "china new algorithm" (Expand Search), "china leiden 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: (((("client needs algorithm") OR ("china needs algorithm"))) OR ("client sampling algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"client needs algorithm\") OR (\"china needs algorithm\"))) OR (\"client sampling algorithm\"))".
• Removing quotes may allow a broader search: (((( client needs algorithm ) OR ( china needs algorithm ))) OR ( client sampling algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("client needs algorithm") OR ("china needs algorithm"))) OR ("client sampling algorithm"))*.