Perhaps you should try some spelling variations:
estimation algorithmss » estimation algorithm, optimization algorithms
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
objective estimation » objective optimization, objective allocation
network estimation » network optimization

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 objective estimation algorithmss ) OR ( defined network estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified objective estimation algorithmss ) or ( defined network estimation algorithms ))*.