Perhaps you should try some spelling variations:
"modified risk optimization algorithms" » "modified risk estimation algorithms", "modified risk estimation algorithm", "modified risk optimized algorithms", "modified robust optimization algorithms", "modified _ optimization algorithms", "modified game optimization algorithms", "modified bi1 optimization algorithms"
"modified parameter optimisation algorithm" » "modified parameter optimization algorithm", "modified parameter estimation algorithm", "modified parameter estimation algorithms"

Try widening your search to All Fields.

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

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