Perhaps you should try some spelling variations:
"modified location optimization algorithms" » "modified location optimisation algorithm", "modified location estimation algorithms", "modified location estimation algorithm", "modified allocation optimization algorithms", "modified static optimization algorithms", "modified carbon optimization algorithms"
"modified based gradation algorithm" » "modified based predation algorithm", "modified based estimation algorithm", "modified based evaluation algorithm", "modified based prediction algorithm", "modified male gradation 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 based gradation algorithm") OR ("modified location optimization algorithms"))~.
• Removing quotes may allow a broader search: (( modified based gradation algorithm ) or ( modified location optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified based gradation algorithm") or ("modified location optimization algorithms"))*.