Perhaps you should try some spelling variations:
"modified response optimisation algorithms" » "modified response optimization algorithms", "modified response estimation algorithms", "modified response estimation algorithm", "modified response optimization algorithmss", "modified response estimation algorithmss"
"modified parameter optimisation algorithm" » "modified parameter optimization algorithm", "modified parameter estimation algorithm", "modified parameter optimization algorithms", "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 parameter optimisation algorithm") or ("modified response optimisation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified parameter optimisation algorithm") OR ("modified response optimisation algorithms")).
• Removing quotes may allow a broader search: (( modified parameter optimisation algorithm ) or ( modified response optimisation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified parameter optimisation algorithm") or ("modified response optimisation algorithms"))*.