Perhaps you should try some spelling variations:
parameters optimization » parameter optimization, parameter estimation
optimization algorithm » optimization algorithms, estimation algorithm, estimation algorithms
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
risk optimisation » _ optimisation, risk estimation

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( parameters optimization algorithm ) or ( risk optimisation algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( parameters optimization algorithm ) OR ( risk optimisation algorithm ))*.