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