Perhaps you should try some spelling variations:
estimation algorithmssss » estimation algorithms, estimation algorithm
parameters optimization » parameter optimization, parameter estimation
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
write estimation » risk estimation, pose 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: (( parameters optimization algorithms ) OR ( write estimation algorithmssss ))~.
• Adding a wildcard symbol may retrieve word variants: (( parameters optimization algorithms ) or ( write estimation algorithmssss ))*.