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"
"modified time approximation algorithms" » "modified one approximation algorithms", "modified _ approximation algorithms", "modified bi1 approximation algorithms", "modified male 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: "((\"modified time approximation algorithms\") OR (\"defined network optimisation algorithm\"))~".
• Removing quotes may allow a broader search: (( modified time approximation algorithms ) OR ( defined network optimisation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified time approximation algorithms") OR ("defined network optimisation algorithm"))*.