Perhaps you should try some spelling variations:
matching algorithm » mining algorithm (Expand Search), tracking algorithm (Expand Search)
sampling algorithm » mining algorithm (Expand Search)
mapping algorithm » mining algorithm (Expand Search), learning algorithm (Expand Search), tracking algorithm (Expand Search)
element mapping » elemental mapping (Expand Search), element modeling (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 algorithm) OR (sampling algorithm))\\") OR (\\"element mapping algorithm\\"))\"".
• Removing quotes may allow a broader search: (( element ((matching algorithm) OR (sampling algorithm)) ) OR ( element mapping algorithm )).