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"))*.