Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
network estimation » network optimization
modified network » certified network, defined network, modified near
using methods » nursing methods, making methods, counting methods
core using » code using, care nursing

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: (( core using methods algorithm ) OR ( modified network estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (( core using methods algorithm ) or ( modified network estimation algorithms ))*.