Perhaps you should try some spelling variations:
"modified notion optimized algorithms" » "modified notion optimized algorithm", "modified notion optimizer algorithms", "modified notion optimization algorithms"
"modified one approximation algorithms" » "modified time approximation algorithms", "modified _ approximation algorithms", "modified rough approximations algorithms", "modified male approximation algorithms", "modified near approximation algorithms", "modified orca 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: (("modified one approximation algorithms") OR ("modified notion optimized algorithms"))~.
• Removing quotes may allow a broader search: (( modified one approximation algorithms ) or ( modified notion optimized algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified one approximation algorithms") or ("modified notion optimized algorithms"))*.