Perhaps you should try some spelling variations:
estimation algorithmssss » estimation algorithm
parameters estimation » parameter estimation, parameter estimates, parameter optimization
allocation estimation » allocation optimization, motion estimation
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm

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 estimation algorithmssss ) OR ( allocation estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (( parameters estimation algorithmssss ) or ( allocation estimation algorithms ))*.