Perhaps you should try some spelling variations:
"modified robust optimisation algorithm" » "modified robust optimization algorithms", "modified robust estimation algorithm", "modified robust estimation algorithms", "modified robust optimization algorithm"
"modified network approximation algorithms" » "certified network approximation algorithms", "defined network approximation algorithms", "modified near approximation algorithms"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified robust optimisation algorithm") or ("modified network approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified robust optimisation algorithm") OR ("modified network approximation algorithms")).
• Removing quotes may allow a broader search: (( modified robust optimisation algorithm ) or ( modified network approximation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified robust optimisation algorithm") or ("modified network approximation algorithms"))*.