Perhaps you should try some spelling variations:
"binary ppk level optimization algorithm" » "binary ppk global optimization algorithm" (Expand Search), "binary pdm level optimization algorithm" (Expand Search)
"binary data based optimization algorithm" » "binary rat based optimization 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: "((\"binary data based optimization algorithm\") OR (\"binary ppk level optimization algorithm\"))~".
• Removing quotes may allow a broader search: (( binary data based optimization algorithm ) OR ( binary ppk level optimization algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("binary data based optimization algorithm") OR ("binary ppk level optimization algorithm"))*.