Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"modified make estimation algorithmss" » "modified make estimation algorithms", "modified make optimization algorithms", "modified pose estimation algorithmss", "modified male estimation algorithmss"

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 estimation algorithm") OR ("modified make estimation algorithmss"))~.
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