Perhaps you should try some spelling variations:
"modified robust optimisation algorithmsss" » "modified robust optimisation algorithm", "modified robust optimization algorithms", "modified robust estimation algorithms", "modified robust optimization algorithmsss", "modified robust optimisation algorithmss"
"modified objective approximation algorithms" » "modified objective approximation algorithm"

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