Perhaps you should try some spelling variations:
"modified one approximation algorithm" » "modified one approximation algorithms", "modified time approximation algorithm", "modified _ approximation algorithm", "modified rough approximations algorithm", "modified male approximation algorithm", "modified near approximation algorithm", "modified orca approximation algorithm"
"model learning method algorithm" » "model learning mom algorithm", "model learning methods algorithm", "model graining methods algorithm", "model learning emotion algorithm", "mobile learning method algorithm"

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: (("model learning method algorithm") OR ("modified one approximation algorithm"))~.
• Removing quotes may allow a broader search: (( model learning method algorithm ) or ( modified one approximation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("model learning method algorithm") or ("modified one approximation algorithm"))*.