Perhaps you should try some spelling variations:
"modified notion optimisation algorithm" » "modified notion optimization algorithms", "modified notion estimation algorithm", "modified notion estimation algorithms", "modified network optimization algorithm"
"modified df approximation algorithms" » "modified _ approximation algorithms", "modified one approximation algorithms", "modified time approximation algorithms", "modified adam approximation algorithms", "modified bi1 approximation algorithms"

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 notion optimisation algorithm") OR ("modified df approximation algorithms"))~.
• Removing quotes may allow a broader search: (( modified notion optimisation algorithm ) or ( modified df approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified notion optimisation algorithm") or ("modified df approximation algorithms"))*.