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