Perhaps you should try some spelling variations:
"_ optimizer algorithms" » "_ optimized algorithms", "_ optimization algorithms", "_ optimize algorithms", "_ optimise algorithms"
"_ optimized algorithm" » "_ optimized algorithms"
"one approximation algorithms" » "time approximation algorithms", "_ approximation algorithms", "rough approximations algorithms"

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

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