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