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