Perhaps you should try some spelling variations:
"modified staffing optimization algorithms" » "modified staffing optimisation algorithm", "modified staffing estimation algorithms", "modified staffing optimized algorithms", "modified caging optimization algorithms"
"modified orca estimation algorithm" » "modified dorca estimation algorithm", "modified orcad estimation algorithm", "modified ohca estimation algorithm"

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 orca estimation algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified staffing optimization algorithms\") OR (\"modified orca estimation algorithm\"))".
• Removing quotes may allow a broader search: (( modified staffing optimization algorithms ) OR ( modified orca estimation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified staffing optimization algorithms") OR ("modified orca estimation algorithm"))*.