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