Perhaps you should try some spelling variations:
"polynomial-time approximationsss algorithm" » "polynomial-time approximation algorithm", "polynomial-time approximation algorithms"
"polynomial-rough approximations algorithms" » "polynomial-rough approximation algorithms", "polynomial-rough approximation algorithm", "polynomial-one 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 approximationsss algorithm") OR ("polynomial-rough approximations algorithms"))~.
• Removing quotes may allow a broader search: (( polynomial-time approximationsss algorithm ) or ( polynomial-rough approximations algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("polynomial-time approximationsss algorithm") or ("polynomial-rough approximations algorithms"))*.