Perhaps you should try some spelling variations:
"modified robust optimization algorithms" » "modified robust optimisation algorithm", "modified robust estimation algorithms", "modified robust estimation algorithm"
"modified parameters estimation algorithmss" » "modified parameters estimation algorithms", "modified parameters estimation algorithm", "modified parameter estimation algorithmss", "modified parameter estimates algorithmss", "modified parameter optimization algorithmss"

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 robust optimization algorithms") or ("modified parameters estimation algorithmss"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified robust optimization algorithms") OR ("modified parameters estimation algorithmss")).
• Removing quotes may allow a broader search: (( modified robust optimization algorithms ) or ( modified parameters estimation algorithmss )).
• Adding a wildcard symbol may retrieve word variants: (("modified robust optimization algorithms") or ("modified parameters estimation algorithmss"))*.