Perhaps you should try some spelling variations:
"modified rough approximations algorithm" » "modified rough approximation algorithm", "modified rough approximation algorithms", "modified one approximation algorithm"
"modified notion optimization algorithms" » "modified notion optimisation algorithm", "modified notion estimation algorithms", "modified notion estimation algorithm", "modified network optimization algorithms", "modified policy optimization algorithms", "modified allocation optimization 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 notion optimization algorithms") or ("modified rough approximations algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified notion optimization algorithms") OR ("modified rough approximations algorithm")).
• Removing quotes may allow a broader search: (( modified notion optimization algorithms ) or ( modified rough approximations algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified notion optimization algorithms") or ("modified rough approximations algorithm"))*.