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

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