Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
network estimation » network optimization
mapping learning » machine learning, enabling learning
learning methods » nursing methods
verified network » certified network, defined network

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 methods algorithm ) or ( verified network estimation algorithms ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( mapping learning methods algorithm ) OR ( verified network estimation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (( mapping learning methods algorithm ) or ( verified network estimation algorithms ))*.