Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
network estimation » network optimization
solution algorithm » evolution algorithm, convolution algorithms, evolutionary algorithm
modified network » certified network, defined network, modified near
modified drug » modified df, modified orca

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