Perhaps you should try some spelling variations:
"modified response optimization algorithms" » "modified response optimisation algorithm", "modified response estimation algorithms", "modified response optimized algorithms"
"modified parameter estimation algorithm" » "modified parameter estimates algorithm", "modified parameter optimization algorithm"

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

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