Perhaps you should try some spelling variations:
"element sampling algorithm" » "element scheduling algorithm" (Expand Search)
"elements over algorithm" » "elements deer algorithm" (Expand Search), "elementi per algorithm" (Expand Search)
"element tree algorithms" » "element three algorithms" (Expand Search), "element free algorithms" (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"element sampling algorithm\") OR (\"element tree algorithms\"))) OR (\"elements over algorithm\"))~".
• Removing quotes may allow a broader search: (((( element sampling algorithm ) OR ( element tree algorithms ))) OR ( elements over algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (((("element sampling algorithm") OR ("element tree algorithms"))) OR ("elements over algorithm"))*.