Perhaps you should try some spelling variations:
"defined network optimisation algorithm" » "defined network optimization algorithms", "defined network estimation algorithm", "defined network estimation algorithms", "defined network optimization algorithm", "designed network optimisation 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"defined network optimisation algorithm\") OR (\"modified df approximation algorithms\"))~".
• Removing quotes may allow a broader search: (( defined network optimisation algorithm ) OR ( modified df approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("defined network optimisation algorithm") OR ("modified df approximation algorithms"))*.