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