Perhaps you should try some spelling variations:
"patient sampling algorithm" » "patient scheduling algorithm" (Expand Search), "patients sampling algorithm" (Expand Search)
"sediment means algorithm" » "sediment search algorithm" (Expand Search)
"element model algorithm" » "element mould algorithm" (Expand Search), "elements model 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: (((("patient sampling algorithm") OR ("sediment means algorithm"))) OR ("element model algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"patient sampling algorithm\") OR (\"sediment means algorithm\"))) OR (\"element model algorithm\"))".
• Removing quotes may allow a broader search: (((( patient sampling algorithm ) OR ( sediment means algorithm ))) OR ( element model algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("patient sampling algorithm") OR ("sediment means algorithm"))) OR ("element model algorithm"))*.