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