Perhaps you should try some spelling variations:
"level using algorithm" » "level cosine algorithm" (Expand Search), "level fusion algorithm" (Expand Search)
"element rd algorithm" » "element _ algorithms" (Expand Search), "elements rd algorithm" (Expand Search)
"complement based algorithm" » "implement based algorithm" (Expand Search), "complementary based algorithm" (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("complement based algorithm") OR ("element rd algorithm"))) OR ("level using algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"complement based algorithm\") OR (\"element rd algorithm\"))) OR (\"level using algorithm\"))*".
• Removing quotes may allow a broader search: (((( complement based algorithm ) OR ( element rd algorithm ))) OR ( level using algorithm ))*.