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