Perhaps you should try some spelling variations:
"modified robust optimization algorithms" » "modified robust optimisation algorithm", "modified robust estimation algorithms", "modified robust estimation algorithm"
"modified one approximation algorithms" » "modified time approximation algorithms", "modified _ approximation algorithms", "modified rough approximations algorithms", "modified male approximation algorithms", "modified near approximation algorithms", "modified orca approximation algorithms"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified one approximation algorithms") OR ("modified robust optimization algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified one approximation algorithms\") OR (\"modified robust optimization algorithms\"))".
• Removing quotes may allow a broader search: (( modified one approximation algorithms ) OR ( modified robust optimization algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified one approximation algorithms") OR ("modified robust optimization algorithms"))*.