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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"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"))*.