Perhaps you should try some spelling variations:
"modified parameters optimization algorithms" » "modified parameter optimization algorithms", "modified parameter estimation algorithms", "modified parameters optimisation algorithm", "modified parameters estimation algorithms", "modified parameters estimation algorithm", "modified parameters optimisation algorithms", "modified parameters estimation algorithmss"
"modified staffing optimization algorithm" » "modified staffing optimisation algorithm", "modified staffing estimation algorithm", "modified staffing estimation algorithms", "modified caging optimization algorithm"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified staffing optimization algorithm") OR ("modified parameters optimization algorithms"))~.
• Removing quotes may allow a broader search: (( modified staffing optimization algorithm ) or ( modified parameters optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified staffing optimization algorithm") or ("modified parameters optimization algorithms"))*.