Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
network estimation » network optimization
one approximation » time approximation, _ approximation, rough approximations
modified network » certified network, defined network, modified near
modified one » modified male, modified near, 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 one approximation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified network estimation algorithms ) or ( modified one approximation algorithm ))*.