Perhaps you should try some spelling variations:
"modified make estimation algorithms" » "modified make estimation algorithm", "modified make optimization algorithms", "modified make optimisation algorithm", "modified pose estimation algorithms", "modified male estimation algorithms"
"modified objective optimizer algorithms" » "modified objective optimized algorithms", "modified objective optimized algorithm", "modified objective optimization algorithms", "modified objective optimal algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified make estimation algorithms") OR ("modified objective optimizer algorithms"))~.
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