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