Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
one approximation » time approximation, _ approximation, rough approximations
real algorithm » adam algorithm, search algorithm
modified one » modified male, modified near, modified orca
using real » using metal, using raw
code » core

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( code using real algorithm ) or ( modified one approximation algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( code using real algorithm ) OR ( modified one approximation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (( code using real algorithm ) or ( modified one approximation algorithm ))*.