Perhaps you should try some spelling variations:
"_ approximation algorithm" » "_ approximation algorithms"
"post optimized algorithm" » "post optimized algorithms", "post optimizer algorithms", "most optimized algorithm"
"cost optimized algorithm" » "cost optimized algorithms", "cost optimizer algorithms", "most optimized algorithm"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("post optimized algorithm") OR ("cost optimized algorithm"))) or ("_ approximation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("post optimized algorithm") OR ("cost optimized algorithm"))) OR ("_ approximation algorithm")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"post optimized algorithm\") OR (\"cost optimized algorithm\"))) or (\"_ approximation algorithm\"))".
• Removing quotes may allow a broader search: (((( post optimized algorithm ) OR ( cost optimized algorithm ))) or ( _ approximation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("post optimized algorithm") OR ("cost optimized algorithm"))) or ("_ approximation algorithm"))*.