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

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

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