Perhaps you should try some spelling variations:
"levels using algorithm" » "levels using algorithms" (Expand Search), "levels routing algorithm" (Expand Search), "levels fusion algorithm" (Expand Search), "level using algorithm" (Expand Search), "models using algorithm" (Expand Search), "cells using algorithm" (Expand Search)
"elements based algorithm" » "experiments based algorithm" (Expand Search), "elements related algorithm" (Expand Search)
"elements fe algorithm" » "elements new algorithm" (Expand Search), "elements de algorithms" (Expand Search), "elements seu algorithm" (Expand Search), "elements _ algorithm" (Expand Search), "element te algorithm" (Expand Search), "elements b 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: (((("elements based algorithm") OR ("elements fe algorithm"))) OR ("levels using algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"elements based algorithm\") OR (\"elements fe algorithm\"))) OR (\"levels using algorithm\"))".
• Removing quotes may allow a broader search: (((( elements based algorithm ) OR ( elements fe algorithm ))) OR ( levels using algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("elements based algorithm") OR ("elements fe algorithm"))) OR ("levels using algorithm"))*.