Perhaps you should try some spelling variations:
"modified exact optimization algorithms" » "modified exact optimisation algorithm", "modified exact estimation algorithms", "modified exact estimation algorithm", "modified game optimization algorithms", "modified stage optimization algorithms"
"modified objective optimization algorithms" » "modified objective optimisation algorithm", "modified objective estimation algorithms", "modified objective estimation algorithm", "modified multiobjective optimization algorithms"

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 exact optimization algorithms") OR ("modified objective optimization algorithms"))~.
• Removing quotes may allow a broader search: (( modified exact optimization algorithms ) or ( modified objective optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified exact optimization algorithms") or ("modified objective optimization algorithms"))*.