Perhaps you should try some spelling variations:
network estimation » network optimization
mapping learning » machine learning, enabling learning
method algorithm » mom algorithm
modified network » certified network, defined network, modified near
learning method » learning methods, graining methods, learning emotion

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

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