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