Perhaps you should try some spelling variations:
"modified effect optimisation algorithm" » "modified effect optimization algorithms", "modified effect estimation algorithm", "modified effect estimation algorithms", "modified effects optimisation algorithm"
"modified network approximation algorithms" » "certified network approximation algorithms", "defined network approximation algorithms", "modified near 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 network approximation algorithms") OR ("modified effect optimisation algorithm"))~.
• Removing quotes may allow a broader search: (( modified network approximation algorithms ) or ( modified effect optimisation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified network approximation algorithms") or ("modified effect optimisation algorithm"))*.