Perhaps you should try some spelling variations:
"modified objective estimation algorithm" » "modified objective optimization algorithm", "modified objective allocation algorithm"
"modified adaptive optimizer algorithms" » "modified adaptive optimized algorithms", "modified adaptive optimized algorithm", "modified adaptive optimization algorithms", "modified passive optimizer 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 estimation algorithm") OR ("modified adaptive optimizer algorithms"))~.
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