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