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