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
modified risk » modified bi1
parameter » parameters

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

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