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