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

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

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