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