Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"modified robust estimation algorithmsss" » "modified robust estimation algorithms", "modified robust optimization algorithmsss", "modified pose estimation algorithmsss", "modified risk estimation algorithmsss"

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