Perhaps you should try some spelling variations:
estimation algorithmssssss » estimation algorithms, estimation algorithm
parameter optimisation » parameter optimization, parameter estimation
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
robust estimation » robust optimization, pose estimation, risk estimation

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: (( parameter optimisation algorithm ) OR ( robust estimation algorithmssssss ))~.
• Adding a wildcard symbol may retrieve word variants: (( parameter optimisation algorithm ) or ( robust estimation algorithmssssss ))*.