Perhaps you should try some spelling variations:
"level using algorithm" » "level using algorithms" (Expand Search), "level routing algorithm" (Expand Search), "level fusion algorithm" (Expand Search), "levels using algorithm" (Expand Search)
"elements cnn algorithm" » "elements mean algorithm" (Expand Search), "elements _ algorithm" (Expand Search), "elements ii algorithm" (Expand Search), "elements crcy algorithm" (Expand Search), "elements ices algorithm" (Expand Search), "elements upon algorithm" (Expand Search)
"implement based algorithm" » "implemented based algorithm" (Expand Search), "implementing based 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: (((("implement based algorithm") OR ("elements cnn algorithm"))) OR ("level using algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"implement based algorithm\") OR (\"elements cnn algorithm\"))) OR (\"level using algorithm\"))".
• Removing quotes may allow a broader search: (((( implement based algorithm ) OR ( elements cnn algorithm ))) OR ( level using algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("implement based algorithm") OR ("elements cnn algorithm"))) OR ("level using algorithm"))*.