Perhaps you should try some spelling variations:
"modified topology optimization algorithms" » "modified topology optimisation algorithm", "modified topology estimation algorithms", "modified topology estimation algorithm"
"modified df approximation algorithm" » "modified df approximation algorithms", "modified _ approximation algorithm", "modified one approximation algorithm", "modified time approximation algorithm", "modified adam approximation algorithm", "modified bi1 approximation 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 algorithms") OR ("modified df approximation algorithm"))~.
• Removing quotes may allow a broader search: (( modified topology optimization algorithms ) or ( modified df approximation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified topology optimization algorithms") or ("modified df approximation algorithm"))*.