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