Perhaps you should try some spelling variations:
"modified objective optimization algorithms" » "modified objective optimisation algorithm", "modified objective estimation algorithms", "modified objective estimation algorithm", "modified multiobjective optimization algorithms"
"modified aging convolution algorithms" » "modified aging evolution algorithm", "modified aging solution algorithm", "modified learning convolution algorithms", "modified caging convolution 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 objective optimization algorithms") OR ("modified aging convolution algorithms"))~.
• Removing quotes may allow a broader search: (( modified objective optimization algorithms ) or ( modified aging convolution algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified objective optimization algorithms") or ("modified aging convolution algorithms"))*.