Perhaps you should try some spelling variations:
sampling algorithm » mining algorithm (Expand Search)
element matching » element mapping (Expand Search), employment matching (Expand Search), element within (Expand Search)
element modeling » element modelling (Expand Search), element model (Expand Search)
element sampling » sediment sampling (Expand Search), element mapping (Expand Search), client sampling (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 matching) OR (element modeling)) algorithm\\") OR (\\"element sampling algorithm\\"))*\"".
• Removing quotes may allow a broader search: (( ((element matching) OR (element modeling)) algorithm ) OR ( element sampling algorithm ))*.