Perhaps you should try some spelling variations:
optimization algorithms » estimation algorithms, estimation algorithm, optimized algorithms
optimisation algorithm » estimation algorithm, estimation algorithms
risk optimisation » _ optimisation, risk estimation
same optimization » game optimization, stage optimization, qoe 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: (( risk optimisation algorithm ) OR ( same optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (( risk optimisation algorithm ) or ( same optimization algorithms ))*.