Perhaps you should try some spelling variations:
"Polynomial-rough approximations algorithm" » "Polynomial-rough approximation algorithm", "Polynomial-one approximation algorithm"
"polynomial-time approximation algorithms" » "polynomial-one approximation algorithms", "polynomial-_ approximation algorithms"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("polynomial-time approximation algorithms") OR ("Polynomial-rough approximations algorithm"))~.
• Removing quotes may allow a broader search: (( polynomial-time approximation algorithms ) or ( Polynomial-rough approximations algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("polynomial-time approximation algorithms") or ("Polynomial-rough approximations algorithm"))*.