Perhaps you should try some spelling variations:
"modified topology optimization algorithmss" » "modified topology optimization algorithms", "modified topology optimisation algorithm", "modified topology estimation algorithms"
"modified parameter estimation algorithm" » "modified parameter estimates algorithm", "modified parameter optimization algorithm"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified topology optimization algorithmss") OR ("modified parameter estimation algorithm"))~.
• Removing quotes may allow a broader search: (( modified topology optimization algorithmss ) or ( modified parameter estimation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified topology optimization algorithmss") or ("modified parameter estimation algorithm"))*.