Perhaps you should try some spelling variations:
"level using algorithm" » "level cosine algorithm" (Expand Search), "level fusion algorithm" (Expand Search)
"elements cnn algorithm" » "elements rd algorithm" (Expand Search), "elements colony algorithm" (Expand Search), "elements cosine algorithm" (Expand Search), "elements _ algorithm" (Expand Search)
"complement c3 algorithm" » "complement rd algorithm" (Expand Search), "complement _ algorithms" (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 cnn algorithm") OR ("complement c3 algorithm"))) OR ("level using algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"elements cnn algorithm\") OR (\"complement c3 algorithm\"))) OR (\"level using algorithm\"))".
• Removing quotes may allow a broader search: (((( elements cnn algorithm ) OR ( complement c3 algorithm ))) OR ( level using algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("elements cnn algorithm") OR ("complement c3 algorithm"))) OR ("level using algorithm"))*.