Perhaps you should try some spelling variations:
"experiments using algorithms" » "experiments cosine algorithm" (Expand Search)
"level coding algorithm" » "level cosine algorithm" (Expand Search), "level colony algorithm" (Expand Search), "level scheduling algorithm" (Expand Search)
"elements ppo algorithm" » "elements rd algorithm" (Expand Search), "elements _ algorithm" (Expand Search), "elementi per algorithm" (Expand Search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"elements ppo algorithm\") OR (\"experiments using algorithms\"))) OR (\"level coding algorithm\"))~".
• Removing quotes may allow a broader search: (((( elements ppo algorithm ) OR ( experiments using algorithms ))) OR ( level coding algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (((("elements ppo algorithm") OR ("experiments using algorithms"))) OR ("level coding algorithm"))*.