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