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

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 approximation algorithms") or ("modified topology optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified parameter approximation algorithms") OR ("modified topology optimization algorithm"))*.
• Removing quotes may allow a broader search: (( modified parameter approximation algorithms ) or ( modified topology optimization algorithm ))*.