Perhaps you should try some spelling variations:
"modified global optimization algorithms" » "modified global optimisation algorithm", "modified global estimation algorithms", "modified global estimation algorithm"
"modified objective allocation algorithms" » "modified objective estimation algorithms", "modified objective approximation 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 global optimization algorithms") OR ("modified objective allocation algorithms"))~.
• Removing quotes may allow a broader search: (( modified global optimization algorithms ) or ( modified objective allocation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified global optimization algorithms") or ("modified objective allocation algorithms"))*.