Perhaps you should try some spelling variations:
"binary rat _ optimization algorithm" » "binary rate _ optimization algorithm" (Expand Search), "binary rats _ optimization algorithm" (Expand Search)
"binary bret based optimization algorithm" » "binary brett based optimization algorithm" (Expand Search), "binary brent based optimization algorithm" (Expand Search), "binary bet based optimization algorithm" (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("binary rat _ optimization algorithm") OR ("binary bret based optimization algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"binary rat _ optimization algorithm\") OR (\"binary bret based optimization algorithm\"))*".
• Removing quotes may allow a broader search: (( binary rat _ optimization algorithm ) OR ( binary bret based optimization algorithm ))*.