Perhaps you should try some spelling variations:
estimation algorithmss » estimation algorithm, optimization algorithms
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
passive estimation » pose estimation
network estimation » network optimization
modified passive » modified adaptive
certified » verified

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